The chronicle also states that the gens (clan) Ják descended from Vecelin, thus Koppány also belonged to this kindred, as it was first identified by historian János Karácsonyi.
[2] However, Benedictine historian Lajos J. Csóka proved that, instead of the Jáks, the gens Rád descended from Vecelin, who was granted lands in the northernmost part of Somogy County after Stephen's victory.
According to a 1134 judgment letter by Felician, Archbishop of Esztergom, which recounts in detail the foundation of the Diocese of Zagreb around 1090, Koppány took part in the process alongside Fancica.
Bálint Hóman and József Gerics accepted this identification, while György Györffy also considered that Koppány functioned as an intermediary of the family memory for his contemporaneous chronicler.
The Illuminated Chronicle narrates that "the Bishops Koppány and Lawrence and many other brave warriors were pierced with arrows and slain", when the Cumans raided the king's camp.
[7] The late 12th-century Annales Posonienses also mentions that Koppány was killed by the Cumans in 1100 (correctly, 1099), but Lawrence's death in the same year is not connected to the campaign.