Engelred is some kind of servant or guard for Reginald Front-de-Boeuf. We know nothing more about him because he only appears in one sentence: "Go, search [the outlaws] out, Engelred" (25.38).
Torquil Wolfganger was a friend of Cedric's father. He was the original owner of the castle at Torquilstone, until the first Reginald Front-de-Boeuf stole it from him. Front-de-Boeuf, Sr. slaughtered Wolfganger and his seven sons just to get the castle. The only survivor among Wolfganger's children is Ulrica, whom Reginald Front-de-Boeuf has been keeping captive in Torquilstone for years.