Descendants of King William II’s killer keen to donate triptych depicting death to British museum

Latin-inscribed artwork tells story of Walter Tirel whose son killed monarch, William the Conqueror's son

The Italian descendants of King William II's killer want to donate a work of medieval art partly depicting William's death to a British museum.

The three-slab triptych, believed to have been made by a Norman artist in 1100, has been owned by the Tirelli family, whose aristocratic origins can be traced back to France, for over 400 years.