1 adjectives to describe sithence

Something straunge it is that is recorded of Argus, a man that had no lesse than an hundred eyes, unto whose custody Juno committed Io, the daughter of Inachus, being transformed into a young heifer: while Argus (his luck being such) was slaine sleeping, but the Goddess Juno so provided that all his eyes (whatsoever became of his carkasse) should be placed on the pecock's taile; wherupon (sithence it came to passe)

1 adjectives to describe  sithence