Fortnith

[…]to Anne Mercer, my daughter, the some of xiiij li., according to an agrement between her husband and me, to be paid within one fortnith of the death of my wiffe.

Source: wiktionary

[…] & palmson fare which is kept the thursday before palme sunday all in the towne, & this fare setts all the fortnith fares for the year Round.

Source: wiktionary

To dark is still used in Swaledale (Yorkshire) in the sense of to lie hid, as, 'Te rattens [rats] mun ha bin darkin whel nu [till now]; we hannot heerd tem tis last fortnith'.

Source: wiktionary