Margaret of Sicily (1237–1270), (Margarethe von Hohenstaufen), Imperial Princess and Margravine of Meissen, was the youngest legitimate daughter of Emperor Frederick II, King of Sicily, by his wife, Isabella of England, daughter of King John Lackland. She married Albrecht "der Entartete", Margrave of Meissen in 1254. Her son was Margrave Frederick I, namesake of her father, whose descendants became Elector-Dukes of Saxony. // Events Thomas II of Savoy becomes count of Flanders. ... For broader historical context, see 1270s and 13th century. ... Frederick II (left) meets al-Kamil (right) Frederick II (December 26, 1194 - (December 13, 1250), Holy Roman Emperor of the Hohenstaufen dynasty, was pretender to the title of King of the Romans from 1212, unopposed holder of that monarchy from 1215, and Holy Roman Emperor from 1220 until his death... The wedding of Frederick II, Holy Roman Emperor and Isabella. ... John of England depicted in Cassells History of England (1902) John (French: Jean) (December 24, 1166/67–October 18/19, 1216) reigned as King of England from 1199 to 1216. ... Albrecht II, der Entartete (the Degenerate) (1240 – 20 November 1314, Erfurt), Markgraf of Meißen and Landgraf of Thuringia, son of Henry III, Markgraf of Meißen and Constantia of Austria. ... For broader historical context, see 1250s and 13th century. ... Friedrich I der Freidige (16 November 1257-16 November 1323) was Margrave of Meissen and Landgrave of Thuringia. ... With an area of 18,413 km² and a population of 4. ...