Around 1335 Thomas Musgrave 1st Baron Musgrave (age 33) and Margaret Ros Baroness Musgrave (age 37) were married. She by marriage Baroness Musgrave.

After 20 May 1344 Thomas Musgrave 1st Baron Musgrave (age 42) and Isabel Berkeley Baroness Clifford Baroness Musgrave (age 37) were married. She by marriage Baroness Musgrave. She a great x 3 granddaughter of King John "Lackland" of England.