Philip of Swabia, King of Germany
Count Otto VIII of Wittelsbach, killed in 1209, son of Count Otto VII of Wittelsbach and murderer of king Philip of Swabia
Meanwhile, a number of princes hostile to Philip, under the leadership of Adolph, Archbishop of Cologne, had elected an anti-king in the person of Otto, second son of Henry the Lion, duke of Saxony.
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In the conflict between the rivaling House of Hohenstaufen and the Welfs around the German throne, he originally continued his brother's support for their relative Philip of Swabia, grandnephew of King Conrad III, who had been elected King of the Romans in 1198.
A report of a Pentecostal festival from 1194 in Milano, in which the emperor Henry VI, Conrad II, Duke of Swabia, Philip of Swabia, Henry V, Count Palatine of the Rhine, and Bligger von Steinach.
In 1231, John of Dinklage and his son Bertram (an armored knight) backed Vechta, which was allied with Emperor Philip of Swabia in a dispute with Otto of Brunswick, who was allied with the Cloppenburg Count von Tecklenburg.
In September 1198 Frederick's younger half-brother Ottokar I made use of the rivalry among Otto IV from the House of Welf and the Hohenstaufen duke Philip of Swabia, youngest son of Emperor Frederick Barbarossa, who both had been elected King of the Romans.