I have always wondered whether this guy was out proto-Caldwell.

Reference: The Acts of William I, King of Scots 1165-1214
Book by G. W. S. Barrow; Edinburgh University Press, 1971

Thomas de Colville was arrested in May, 1210, charged with treason, and imprisoned in Edinburgh castle; he ransomed himself on 30 November ( Chron. Melrose, 54). He was presumably Thomas de Colville, surnamed 'the Scot', lord of Carsphairn in Galloway, a dependent of Duncan of Carrick.

died 1219

l.48 Ricardo Cumin. Philippo de Coleuilla

[Latin spelling =Colville or =Caldwell?]

Witness to many charters of William I.

Example:
Ricardo de Morevill Constabularo
Alano Dapifero
Willelmo de Morevill
Rannulfo de Sol
Geruasio Aunel
Bernado filio Brien
Waltero de Windesh
Thoma de Colev

Jocelino archdiacono Dunkeldensi
Willelmo priore de Fostynoth
Radulfo capallano meo
Ricardo prebenda clerico meo
comise Dunecano
comise Gilberto
Willelmo de Lyndes
Roberso de Londoniis
Malcolmo filio comitis Dunecani
Johanne de Hasting
Willelmo Cumyn
Willelmo de Hays
Geriasio Auenel
Thoma de Colleuil

Willelmo de Lindes
Geruasio Auenil
Johanne de Hasting
Willelmo Cumin
Thoma de Coleuill
Henrico Biset
Alexandro de Sintun
Willelmo de Herizg
Philippo de Lundin

Obvious variations in spelling in the charters from modern versions but it is a long bow to take Coleuill to Caldwell.

This was the fellow who was surnamed "le Scot" and was important enough to be on 13 charters in this book along with other persons of note - often the same people.

He was from Carphairn in Galloway and a dependent of Duncan of Carrick. Earl Duncan was a native Scot and not a Norman so there might be something in the fact that Thomas Colville might have been called "le Scot" to distinguish him from his conntemporary Philip de Colville who may well have been of Norman ancestry.

Thomas Colville le Scot was also granted Dalmellington at some stage - this holds well with his vassalage to Duncan of Carrick. It also shows a base at Carsphairn in Galloway which helps with the "Caldwell Legend".

He is signing charters with the de Morevilles and may well have been associated with them as well and therefore getting pretty close to Caldwell on the Renfrew border.

No flames but just a little smoke. Will keep looking.