Sholto Douglas was the mythical Progenitor of Clan Douglas, a powerful and warlike family in Medieval Scotland. A Mythical battle took place: "in 767, between King Solvathius rightful king of Scotland and a pretender Donald Bane. The victory was so nearly Donald's when a certain noble man, disdaining to see so bad a cause have good successe, struck in for the king and turned the fortunes of the day. When the king inquired about the knight who had done such valuable service, somebody exclaimed "Sholto du glasse!"..."Behold the black gray man!".." (Ane Historie of the House and Race of Douglas and Angus, David Hume of Godscroft, Edinburgh 1646).
The above article in Wikipedia has given rise to an interesting debate about the origins of the family, and in particular, about the Italian connection.
You can follow it on the Talk page for Sholto Douglas
I do not know who Brendandh is, but he/she has contributed to many Douglas pages.