However, when Béla IV, who had long opposed father's political and economic reforms, ascended the Hungarian throne in 1235, they became disgraced and the overwhelming majority of their lands were confiscated.
[2] Sometime around 1270, Peter entered the service of the powerful lord Joachim Gutkeled, who served as Ban of Slavonia from that year and was a central figure of the 1270s civil wars and feudal anarchy.
Peter was present in the recapture of Győr and Szombathely in August, and also fought in the successful attack at Nagyszombat (today Trnava, Slovakia), where the town was recovered during the second phase of Ottokar's invasion in the autumn of 1273.
[4] During the 1270s internal conflict under the minor Ladislaus' reign, Peter belonged to the Kőszegi–Gutkeled baronial group, which fought for the supreme power and political control over the royal council against the Csák–Aba faction.
Although the Hungarian royal army was able to suppress the rebellion by August 1277, where Peter also participated, but his lord Joachim Gutkeled was killed in a battle in April 1277 and his oligarchic domain quickly disintegrated due to the partition agreements between the Kőszegis and the Babonići.
[5] According to Croatian historian Antun Nekić, Peter's political ascension took place because the Csáks, who dominated the royal council since 1277 decided to deprive the Gutkeleds from power for unknown reasons sometime after July 1279, despite their temporary alliance against the Kőszegis which was concluded after Joachim's death.
[6] In contrast, historian Attila Zsoldos considered Ladislaus IV, who was declared to be of age in May 1277, pursued an active and independent policy in the years 1277–1281, and Peter was able to rise to the narrow elite of the realm, because he faithfully supported the monarch against papal legate Philip, Bishop of Fermo over the Cuman question.
[5] He presided over a general assembly (congregatio generalis) of the realm of Slavonia (regni Sclavonie) during that time, where he confirmed some of their previous privileges to brothers Pousa and Gecse Türje.
[10] It is plausible that Peter was that family member, who built the castle of Dobra Kuća (Hungarian: Dobrakucsa), laid near present-day Daruvar in Croatia, on the top of the Papuk mountain, which later became a royal property in 1335.
[15] Croatian historian Antun Nekić considered Peter belonged to the court of Elizabeth, then Duchess of Macsó and Bosnia, representing her interests in Garić and Gerzence against the Diocese of Zagreb and the Kőszegi family.
[18] Peter's sons, Lawrence and Nicholas appeared before the collegiate chapter of Buda (a place of authentication) on behalf of their uncle Kemény in 1286, and paid off the dower (i.e. a portion in Peker estate) of the unidentified widow of the late Abraham Tétény to the Dominican nunnery at Margaret Island, in accordance with her last will and testament.