From Colonial Families of the United States of America, Vol. III, p. 48:

Philip Thomas, b. 1620, in Bristol, England; d. in Anne Arundel Co., Md., July, 1675; emigrated to Maryland in 1650 with his wife, Sarah Harrison. Before 1655 he was commisioned Lieutenant of the provincial forces. In 1656 he was a member of the High Commission to govern the colony under Lord Protector Cromwell. 22d Mar. 1657-58, he was one of the commisssioners to surrender the government to Lord Baltimore. He was a direct lineal descendant, fifth generation, of Lady Catherine Howard, who m. Rice ap Griffith, of Carew (1508-31). Lady Catherine Howard was a direct lineal descendant of Edward I, of England (1239-1307).