leman

noun2

1. •
   A paramour.

   • And he sent the news to William the Lyon, sitting drinking the wine and fondling his bonny lemans in Edinburgh Town, and William made him the Knight of Kinraddie[…]. — 1932
2. •
   (no longer used) One beloved; a lover, a sweetheart of either sex (especially a secret lover; a gallant or mistress).

   • The prisoner I speak of is better booty—a jolly monk riding to visit his leman, an I may judge by his horse-gear and wearing apparel. — 1819