Definition of "shoulden"

How ſhoulden ſhepheardes liue, if not ſo?

1579, Immeritô [pseudonym; Edmund Spenser], “Maye. Ægloga Quinta.”, in The Shepheardes Calender: […], London: […] Hugh Singleton, […]; reprinted as H[einrich] Oskar Sommer, editor, The Shepheardes Calender […], London: John C. Nimmo, […], 1890, folio 18, verso

For thy we shoulden take keepe of our Race

1614, John Davies of Hereford, An Eclogue between yong Willy the Singer of his native Pastorals, and old Wernocke his Friend

And told them whither that they shoulden go.

1614, William Browne, The Shepheards Pipe. The First Eclogue