Guillaume le Maréchal (William the Marshal) was an Anglo-Norman knight, Earl of Pembroke and Lord Marshal of England. In the years 1183 to 1185 he went to Jerusalem and returned to England but he does not appear to have taken part in any fighting, so calling him a crusader might be stretching the point.
Ramsay was married to Margaret Johnstone Marshall the date of the wedding is not known.
William Marshall, Sir Lancelot Depends on time period
Sir Marshall Campbell was born in 1848.
Sir Marshall Campbell died in 1917.
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Sir Edward Marshall Hall was born on September 16, 1858.
Sir Edward Marshall Hall was born on September 16, 1858.
William Thomas Marshall was born on 1854-12-05.
William Thomas Marshall died on 1920-09-11.
William Marshall Roark was born in 1943.
William Marshall Roark died in 1965.
William Leonard Marshall was born in 1944.