On 7 Feb 2023 Paul Roberton wrote on Loudon-59:
Lambinus (or Lambin/Lambert) had a brother, Robert. This from POMs, 3/613/1 (Kel. Lib., no. 336) at Permalink: www.poms.ac.uk/record/source/4505/ "Wice of Wiston has given, granted, and established by this his charter, to Kelso Abbey the church of Wiston (LAN), his villa with its two chapels of the villa of Robert, brother of Lambin, (i.e. Roberton) and the villa of John, stepson of Baldwin, (i.e. Crawford John) to be held by them in perpetual alms, with the land, teinds, pastures, wood, and the other easements of the _villa_ and with all other just pertinents of the church, for the salvation of his lord, King Malcolm, and his brother William, and for the salvation of his soul, his spouse and his heirs and for the soul of his father, his mother and all of his ancestors and successors." FIRM DATE 24 May 1153 X 24 March 1160 PROBABLE DATE probably x 16 Jun 1159 The charter has been interpreted and commented on by several scholars: In the reign of Malcolm IV the manor belonged to Robert (the brother of Lambin who gave name to Lamington" Black G 1968 Surnames of Scotland, p 685. -----' "Lambin of Lamington, his brother Robert of Roberton.... all of these men, although they were the very foundation of the lairds' class in medieval Lanarkshire, are scarcely more than names" Barrow G.W.S 1973/2012 The Kingdom of the Scots p 289. ---- "The only two definite Flemish settlers in Clydesdale, however, were Robert and his brother 'Lambeen Fleeming' or 'Lambin Asa' who gave their names to Roberton and Lamington respectively". Tabraham, C "Castles" in Fleming A and R Mason (eds) Scotland and the Flemish People, 2019 p 77. ---' Further commentary from independent scholar Laurian Toorians states: "Returning from supposed to explicitly named Flemings we now turn to Robert, who left his name in Roberton in Upper Clydesdale and who appears as brother of Lambein Fleeming (46). It is after this Lambin the Fleming that nearby Lamington is named. This same Lambin appears in the sources also as Lambin Asa, generally taken to mean "Lambin son of Asa". The estate Lambin had in Lamington was a fief held from the crown direct, just as most of the other "Flemish" estates in the area were. Apart from this estate, he also held Draffan and "Dardarach" (in the parish of Lesmahagow) in feu-ferme from Kelso Abbey (47)... Lambin the Fleming's son James held Loudoun as an under-fief of Richard de Morville (49). Toorians L Flemish settlements in 12th Century Scotland in Revue belge de Philologie et d'Histoire p 666-667 https://www.persee.fr/doc/rbph_0035-0818_1996_num_74_3_4120 I'm not pre-1700 certified so won't go adding the brother. Just hoping I can present an argument for his addition by someone else.