STEWART, Walter 3rd High Steward and Justiciar of Scotland ²

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  General Notes:

"WALTER, third High Stewart, was the first to adopt the name of his office as a surname. He was appointed
Justiciar of Scotland by Alexander n. in 1230, and negotiated that king's second marriage."

from Scots Peerage ¹

Walter married Beatrix, daughter of Gilchrist 3rd Earl of Angus and Unknown.¹ (Beatrix was born about 1180.)

  Marriage Notes:

"He (Walter Stewart) is said by Duncan Stewart to have married Beatrix, daughter of Gilchrist, Earl of Angus, but no proof has been found of this ... "

from Scots Peerage (vol 1) ¹