was Look up was at Dictionary.com
O.E. wesan, węs, węron 1st and 3rd person sing. of wesan "to remain," from P.Gmc. *wesanan (cf. O.S. wesan, O.N. vesa, O.Fris. wesa, M.Du. wesen, Du. wezen, O.H.G. wesen "being, existence," Goth. wisan "to be"), from PIE base *wes- "remain, abide, dwell" (cf. Skt. vasati "he dwells, stays;" cf. vestal). Wesan was a distinct verb in O.E., but it came to supply the past tense of am. This began to develop in P.Gmc., since it is also the case in Gothic and Old Norse. See be.