Robert de Welle

Can any of your correspondents inform me of what family was Robert de Welle, who married Matilda, one of the co-heirs of Thomas de Clare, and in 15th Edward II. received seisin of possessions in Ireland, and a mediety of the Seneschalship of the Forest of Essex in her right? (*Rotul. Original., Record Commission*, pp. 266, 277.) And how came the Irish title of Baron Welles into the family of Knox? Again, where can I meet with a song called the Derby Ram, very popular in my school-boy days, but of which I recollect only one stanza,— "The man that killed the ram, Sir, Was up to his knees in bloo…