Remarks:
 He was the Laird of Nether Holm of Dalquhairn. 
  
 David was living in Braidenoch when he took a lease of 
 Furmiston and Marbrack. Shortly after 1719, he was in a 
 position to purchase Nether Holm of Dalquhairn. In 1734 he 
 purchased Auchenshinnoch and on the Auchenshinnoch Slab 
 Cross is engraved the following :- “DAVÌD MCMILLAN AND 
 FLORANC HOUATSON BOUGHT AND PAYED THIS GROUN THE 
 YEAR 1734.”* 
 He married Florence Howatson and had issue : Robert, 
 who succeeded to Holm, and David, to Auchenshinnoch. The 
 father died at Marbrack. 
  
 Source: Clan Macmillan by Somerled Macmillan 
  
 Somerled Macmillan writer of the book Clan Macmiland is of the opinion that Gilbert was progenitor of the Galloway branch of Macmillans when the occasion of his coming south arose when he and some of his clansmen acted as an escort to Robert the Bruce in 1306, after he had been defeated by the MacDougalls at Tyndrum. 
  
 Three years later,in 1309, Gilbert is styled as the Baron of Ken.