Thorgils Sprakalegg (also called Thorgil, Torkel, Torgils, Thrugils or Sprakalägg) was a Danish nobleman whose children were active in the politics of Denmark and England in the early 11th century and who was grandfather of kings of both nations. Little is recorded about Thorgils in historical texts outside of his place in the genealogy of his children or grandchildren. Thorgils' cognomen Sprakalägg can be translated into English as "Break-leg" or "Strut-leg". The 11th-century English chronicler John of Worcester reports in an entry dated 1049 that Earl Beorn Estrithson was brother of King Svein of Denmark, and son of Danish Earl Ulf, son of Spracling[us], son of Urs[us]. Here Spraclingus is a garbled representation of the byname of Thorgils appearing in later Scandinavian sources, while Ursus is the Latin urso, or bear (Bjørn in Danish, Björn in Swedish). He appears in several 13th-century sources. He is Torgils or Þorgils Sprakaleggs in Knýtlinga saga and in two works of Snorri Sturluson – Óláfs saga helga in Heimskringla, and the Separate Saga of St. Olaf – each time simply as father of Earl Ulf. Two other 13th-century sources relate folklore that derives Thorgils from the mating of a bear with a noblewoman. Danish historian Saxo Grammaticus recorded that the son born to such a union was 'named after his father' (i.e. called 'bear' – Ursus/Björn; in the 14th-century summary of Saxo's work, Compendium Saxonis, he is explicitly named 'Byorn') and was himself father of 'Thrugillus, called Sprageleg', father of Earl Ulf. Saxo further says of 'Thrugillis' that he "lacked not one ounce of his father's valour" (nullo probitatis vestigio a paternae virtutis imitatione defecit). The other source, Gesta Antecessorum Comitis Waldevi, copies the early generations of John of Worcester's pedigree but, confusing two like-named men, replaces Earl Beorn Estrithson as Earl Ulf's son with Björn Boreson, the father of Siward, Earl of Northumbria. This pedigree commences with an episode not found in the Worcester chronicler's pedigree but similar to that of Saxo, that a 'certain nobleman', contrary to the natural order of human procreation, had a white bear as his father and a noblewoman as a mother, before continuing the pedigree with 'Ursus begat Spratlingus'. The chronicle sometimes attributed to the 15th-century John Brompton tells a very similar tale of bear-paternity relating to the birth of Björn Boresune ('bear's son') himself. Historian Timothy Bolton has suggested that the role of a bear in