Efen-boren

According to the Old English Dictionary:

efen-boren

adj. (ptcpl.) Of equal birth:--Ꝥ se mæssepreóst nǽre, gif hé wíf hæfde, ǽnigre óþre láde wyrþe bútan eallswá lǽwede sceolde þe efenboren wǽre, Ll. Th. ii. 256, 38. [Icel. jafn-borinn.] efen-boren