Sweyn Forkbeard all England in 1016, following the deaths of Æthelred and his son Edmund Ironside; he succeeded his brother as King of Denmark in 1019 and eventually also ruled Norway, parts of Sweden, Pomerania, and Schleswig. Cnut and his sons, Harold Harefoot and Harthacnut, ruled England over a combined 26-year period (1016–1042). After Harthacnut's death, the English throne reverted to the House of Wessex under Æthelred's younger son Edward the Confessor (reigned 1042–1066). Sweyn's daughter, Estrid Svendsdatter, was the mother of King Sweyn II of Denmark. Her descendants continue to reign in Denmark to this day. One of them, Margaret of
King Leonardo and His Short Subjects by Mr. Mad (voiced by Norman Rose), a mad scientist with a domineering personality. When each of his schemes falls through, Mr. Mad disappears "as if by magic" before he can be apprehended. Each half-hour episode of "King Leonardo" consisted of five animated segments. Each half-hour included a two-part "King and Odie" episode, with other characters featured in between: Early in the series' NBC run, selected Columbia Pictures theatrical cartoons were aired on the program, some featuring The Fox and the Crow and Li'l Abner. These shorts were added to fill time when production of the early shows was delayed.