Robert de Alfreton of Alfreton and Norton 1 2
From http://cybergata.com/roots/2081.htm :
~The Courcher Book, Or Chartulary, of Whalley Abbey, Vol. II, p. 551, Sir Robert de Lathom married Amicia, sister and coheiress of Thomas de Alfreton. 160
~Cokayne's Complete Peerage, 2nd Edition, (Chaurces), Vol. III, p. 153, footnote (a), William de Chaurces, married Alice, eldest daughter of Robert Alfreton, of Norton, Derby, and Alice was the coheir of her brother Thomas Alfreton. 141
~Parentalia, Genealogical Memoirs, p. 66-67, Sir Robert's wife was Amicia, daughter and coheir of Robert de Alfreton. 863
Robert married Agnes.