Ludwig III, Count of Württemberg
Encyclopedia
Ludwig III was Count of Württemberg. He was probably married to a daughter of count Adalbert III von Dillenburg, whose name is unknown. Ludwig III and Hartmann
Hartmann, Count of Württemberg
Hartmann I was the Count of Württemberg.Hartmann I and his brother Ludwig III both called themselves “Count of Württemberg”, at the time, so it is assumed that they administered the county together. Both were sons of Count Ludwig II...

 were both known as 'Count of Württemberg' in documents of King Otto IV
Otto IV, Holy Roman Emperor
Otto IV of Brunswick was one of two rival kings of the Holy Roman Empire from 1198 on, sole king from 1208 on, and emperor from 1209 on. The only king of the Welf dynasty, he incurred the wrath of Pope Innocent III and was excommunicated in 1215.-Early life:Otto was the third son of Henry the...

 in his Rhineland, Swabian and Franconian palaces at the same time, so it seems they co-managed the county, with one staying at home and the other accompanying the emperor on his travels in Germany and Italy. In 1194 Ludwig took part in the conquest of Sicily by emperor Henry VI
Henry VI, Holy Roman Emperor
Henry VI was King of Germany from 1190 to 1197, Holy Roman Emperor from 1191 to 1197 and King of Sicily from 1194 to 1197.-Early years:Born in Nijmegen,...

and Hartmann accompanied Otto IV to his coronation in Rome on 4 October 1209.
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