'William, a legatee in the will of his grandfather, William Marche, the Elder, executor of his mother's will [1616], and her residuary legatee, apparently d. s. p. about a year after his mother, ...'
↑ Birth year estimated based on estimated birth year of his sister Eulalia and on the fact that he was executor of his mother's will in 1616 (and presumably an adult).
