General Notes

"English Baronies", by Sander's, on pgs. 73, 48 & 49 present the barony for Great Torrington. Sibyl de Torrington inherited one-fifth of the barony. She married a Richard de Umfraville. "She was represented in 1227 by her son Gilbert... who died post 1242..." "The blazon of the Umfravilles of Devon, 'gules, cruislly a rose or,' suggests that they were related to the Umfravilles of Prudhoe, Northumberland, who bore either 'gules, cruislly a cinquefoil or' or 'or, a cinquefoil gules within a bordure azure with horseshoes gules'."
Sanders further  notes the following pedigree as to the Honour of Prudhoe, Northumberland. :  Generations NOT in order. See death dates.
1]Robert I of Redesdale, Northumberland at the time of Domesday
2]Robert II (d. 1145) granted Prudhoe by Henry I
3]Odinel I (date of death unkown)
4]Odinel II (d. 1182) m. Alice de Lucy
5]Robert III (d.s.p. 1190-1194)  and Richard (d. 1226)
6]Gilbert I (d. 1245) m. Maud, Countess of Angus
7]Gilbert II (d. 1307) (became Earl of Angus through his mother) m. Elizabeth Comyn
8]Robert IV (d. 1325) m. Lucy de Kyme
9]Gilbert III
10]Richard m. Sibyl de Torrington (heiress of one-fifth of Great Torrington)
12] Unknown heir, possibly Henry (d. 1272), whose brother John transferred the estates to Gilbert II (d. 1349), leaving William.
Also noted is a likely cadet branch as described in the Honour of Great Torrington, Devon.