4, Excavations at Alt Gl
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Proc Soc Antiq Scot, (1990)0 12 , 95-149, fiche 2:A1-G14 Reconnaissance excavations on Early Historic fortification othed an s r royal site Scotlandn si , 1974-84 , Excavation:4 t GlutAl t ,sa Clyde Rock, Strathclyde, 1974-75 Leslie Alcock Elizabetd *an AlcockhA * SUMMARY As part of a long-term programme of research historically-documentedon fortifications, excava- tions were carried 1974-75in out Dumbartonat Castle, anciently knownClut Alt Clydeor as Rock. These disproved hypothesisthe that nucleara fort, afterpatternthe of Dunadd Dundurn,or couldbe identified on the Rock, but revealed a timber-and-rubble defence of Early Historic date overlooking the isthmus which links the Rock to the mainland. Finds of especial interest include the northernmost examples of imported Mediterranean amphorae of the sixth century AD, and fragments from at least six glass vessels ofgermanic manufacture. Discussion centres on early medieval harbour sites and trade in northern and western Britain. A detailed excavation record and finds catalogue will be found in the microfiche. CONTENTS EXCAVATION SYNTHESIS & DISCUSSION (illuS 1-19) Introduction: character of the excavation and report..................................... 96 Early history.......................................................................8 9 . Clyd setting...........................................................es it Roc d kan 9 9 . The excavation: structures and finds ................................................... 104 Synthesis: history, artefact structures& s ..............................................3 .11 Discussion: early medieval harbour sites and trade....................................... 119 Appendi : gazetteex1 coastaf o r inland an l d sites, AD 450-850 ............................0 13 . Appendi recovere th : x2 yamphori ratB f eo a sherds ....................................8 13 . Appendix 3: Early Medieval sculpture at Dumbarton, by J Higgitt ....................... 139 Acknowledgements.................................................................2 14 . References ........................................................................2 .14 *29 Hamilton Drive, N Glasgo8D 2 wG1 6 9 SOCIET ANTIQUARIEF YO SCOTLANDF SO , 1990 DETAILED EXCAVATION RECORD AND FINDS CATALOGUE (fiche 2:A1-G14: illuS 20-36) Introduction......................................................................2 A : .2 Historical references ............................................................... 2:A3 Clyd esettins Rocit d gkan .......................................................... 2:A8 excavationse Th : The supposed nuclear fort: Cuttings A, B & C................................... 2:A13 defence eastere Th th f eo n spur: Cuttin g......................................E . 2:C9 Southern Terrace of the Beak: Cutting D ....................................... 2:E11 Catalogue of early medieval finds: Early medieval imports, crucibles .............................................. 2:F14 HunteR J Glas ry sb ........................................................ 2:G4 Chronology: Radiometric age-estimates ..................................................... 2:G7 Correlation of historical dates with artefactual and radiometric age-estimates ......... 2:G9 Conclusion: Clyde Rock in the Early Middle Ages .................................... 2:G12 EXCAVATION SYNTHESIS & DISCUSSION INTRODUCTION: CHARACTE EXCAVATIOE TH F RO REPORN& T When a long-term plan for excavating historically-documented fortifications in Scotland was initially formulate 1973n di , Castle Rock Dumbarto obvioun a s nwa s first choice: partly because historica quasi-historicar o l l records spanne perioe dth d fro mid-fifte m th late-ninte th o t h h century AD: partly because of its logistic convenience for a team based in Glasgow University. Despit impressive eth e characte medievae th f ro late d an l r fortification t Dumbartona s , both excavatioe th presene th d nan t report follow rigorousl pattere yth otherf nseriese o th n sthai n ,i t they are restricted to the structures and finds of early historic date - in this case, fifth to ninth centuries AD - except wher dicussioea latef no r remain necessars si orden yi establiso rt structurae hth l sequence. histore Th Castlf yo e Roccoursef o , kis wide,e parth f tro histor Strathclydef yo majo,a r British kingdom whic havy hema descended fro pre-Romae mth n Damnonii e tribth f eo whicd ,an h certainly had a major politico-military role to play in the early development of northern Britain into the kingdom of the Scots (Smyth 1984 is the best general account). But Strathclyde is far too large a unit discuso t excavation a n si n report, eve devotee nmajoon s it o dt r political centre. This accouns i t therefore broadly limited to the history and archaeology of the Rock itself, and to matters directly relevant to them. Non lesse eth t musi , recognizee tb d tha significance tth t merel Roce no th y whaf kn yla ei o t i t was, but where it was (illus 2, 3 & 4). Firstly, it was a formidable seat of kingship: formidable in the objective sense that, ringed by crags and largely surrounded by water, it was exceptionally difficult to assault s demonstratewa s t formidabla , 870bu D siegs ;A it n y esubjectivi a db n i e e sens wells ea , becaus towerine th f eo g rock steps which buttess leves sit l eastern locatio s summitit r fo s n A .(illu s 1), at the junction of the maritime Clyde with the riverine Clyde and Leven, it gave access both to the fertile interior of the two river valleys and no less to the coasts and islands of the Firth of Clyde and the wider seas beyond. ALCOC ALCOCKD KAN : EXCAVATION GLUTT AL ,T SCLYDA E ROCK, STRATHCLYDE, 1974-77 9 5 CLYDE ROCK, DUMBARTON SITE LOCATIO D REGIONANAN L SETTING ILLUS 1 Map: Clyde Rock, Dumbarton, site location and regional setting. certai2, Key possibl& 1 nand : e historically-recorded enclosed Clyd is places 40 e Rockno ; 3, . archaeologically-dated enclosed places; number sgazetteere refeth o t r , Appendix , Clac1.4 h nam Breatann. 5, Carman. 6, land over 300 m OD 98 | SOCIETY OF ANTIQUARIES OF SCOTLAND, 1990 vier ILLU Ai Clydf wo S2 e Rock Vale th Levenf ,e o p lookin u W . CarmagNN n standlefthane th n so d slopf eo the hill in the background. (Photo: RCAMS, Crown copyright) EARLY HISTORY mose Th t important historical referenc Roce th thas ko i e t Bede' n i t s Historia Ecclesiastica, writte An i D 731 describingn whic.I a se e armho th westerdividee tw f sth o e th Pict e f dnth o s froe mth Briton Firthe s- thath Fortf , Clydso d is t han e- Bed e write presene th so t 'ther strongla tp u s ei y defended political centr Britone th f eo s called Alcluith' [civitas munitissima Brettonum quae vocatur Alcluith] (HE 11). Elsewhere he calls it urbs Alcluith, and explains that Alcluith 'means Clyde Rock in their language Britonse thae th (i f ' o t ; Petra Cluit Latinn i ) 'becaus besids i t e i rive e e th f tha ro t name' (HE 112). These statements givversioa Britiss Welse ed u th Ol f nr o h o placename th f eo , attributa o t t ei peopl nationr eo ; assig politicaa t ni l statu civitass sa urbs,d an term whico st wile hw l retur 116)p n( ; makd an e clea defendea s r thawa t i t d plac somf eo e standing alread Ay yDb 731. Before that date, Clyde Roc alreadd kha y appeared under both Latin (petra Cloithe) Irisd an h (Alo Chluaithe) forms, as a seat of kings. Thus in Adomnan's life of Columba, written towards the end of the seventh century, but referring to the late sixth, we hear of King Roderc son of Tothal. In 658 the Annals of Ulster record the death of Guret, while the Tigernach Annals mention the death of Donal Owef o n threl 694n dal so i n e:i cases, ther specifis ei c mentio 'kinf no Clydf go e Rockf o r o ' reignin Clydn go e Rock. late Inth e seventh century ther indees ewa traditioda n which describe kins da Clydf go e Rock ALCOCK AND ALCOCK: EXCAVATIONS AT ALT GLUT, CLYDE ROCK, STRATHCLYDE, 1974-75 | 99 that Coroticus whose excommunication was called for by St Patrick; this would carry the kings of the Rock back to the mid-fifth century. The tradition is first recorded some two centuries after the event; neverthelesy buma t i t regardee sb mors da e reliable than some recent fanciful reinterpretationf so Patrick's conflict with Coroticus. After Bede, there is a further reference to the death of a king of Clyde Rock in 752; one from a dubious source, Symeon of Durham, to a combined Northumbrian and Pictish attack in 756; and a mention of 'the burning of Clyde Rock', whether by accident or in a hostile attack, 'on the 1st of January 780'. We then come to the events which put an end to early medieval Clyde Rock. In AD 870, the Annals of Ulster record that two kings of the Norsemen, Olaf and Ivar, besieged the citadel for four months, and ultimately destroyed and plundered it. This is indeed the last we hear of the name, so we may believe that the destruction was complete. In the following year, according to the Annals, Olaf and Ivar went from Scotland to Dublin with 200 ships and a great booty of British, English and Pictish slaves. These references, then, establish the importance of Clyde Rock for the study of Early Historic defended places and political centres in northern Britain. We may now turn to examine the character Roce oth f k itself alsd wides oan ,it r setting. CLYD SETTINES ROCIT D KGAN (illu) s1 Clyde Rock rises precipitously from the north (true right) bank of the river Clyde to a height of 74 m (24 abov) 0ft e Ordnance Datu fore th twif m mo n i n summits separate deea y db p n i clefts i t I . fac volcania t c plug, comparable with other conica e Campsil hillth n i s ee north-eas Fellth o t s t (Whitlow 1977, 91); but it is visually by far the most striking. Its crags make it naturally defensible, and its location at the confluence of two navigable rivers, the Clyde and the Leven, give it the strategic importance which is revealed in the historical references.