Till the seventeenth century, the possessive case was written without the apostrophe; being formed at different times, in es, is, ys, or s, like the plural; and apparently without rule or uniformity in respect to the doubling of the final consonant: as Goddes, Godes, Godis, Godys, or Gods, for God's; so mannes, mannis, mannys or mans, for man's.