King Philip invests Patriarch Wolfger with imperial regalian rights and attests that his successors do not need to journey to German lands to receive the regalian investiture because the patriarchs of Aquileia are one of the Italian ecclesiastical princes.
Otto VIII of Wittelsbach, count palatine of Bavaria, together with the men of Bishop Ekbert of Bamberg and Istrian Margrave Henry, brothers of House Andechs, murder King Philip of Swabia (notices from the contemporary chronicler Burchard of Ursberg).
At the imperial Diet of Frankfurt, King Otto IV is officially recognized as the sole monarch; the king punishes the culprits involved in the assassination of his rival, the late King Philip of Swabia, including Henry IV of Andechs, the margrave of Istria (notices from the contemporary narrative source Cronica Sancti Petri Erfordensis moderna).