Notes in the profile read:
Surnames being the casual and unstable things they were at this early date, the Lawrences are also known as "de Lancaster". They are NOT to be confused with the Dukes or Earls of Lancaster!
"Thomas" is apparently his proper name, not "James" (who may be somebody else altogether). He was a son, possibly illegitimate, of Roger de Lancaster, not any "Sir Robert" (the "Crusader ancestor" appears to be a family myth - there was such a person but his connection to this family cannot be determined).
Exactly who he married is undocumented, but the "family tradition" is that his wife was Matilda de Wessyngton, married c. 1252.
The children of Lawrence de Lancaster (son of this Thomas) are said to have been the first to use "Lawrence" as a surname.
====