Forrói had a brother Alexander, ancestor of the clan's Sárszó branch, who possessed a portion in Cinkota (present-day a borough of the 16th district of Budapest) in 1295.
[2] It is possible that Alexander is identical with that young knight, who was among the defenders at the siege of Feketehalom (today Codlea, Romania) in the 1264–1265 civil war, and was granted the village of Beret in Abaúj County for his merits by King Stephen V in 1271.
[3] Forrói first appears in contemporary records in 1255, when he bought the estate Moha in Fejér County from Constantine, a canon of the collegiate chapter of Székesfehérvár.
Because of this and his service, Forrói was granted five villages located in the valley of river Hernád in Abaúj (or Újvár) County – Forró, Devecser (today a borough of Encs), Fancsal, Őzd and Gata – with perpetual right and free disposition from Stephen in December 1262, declaring the previous donation letters about them invalid.
[5] Simultaneously, Queen Maria Laskarina also donated the land Orjavica in Požega County (laid in present-day Nova Kapela in Croatia) to Forrói for bringing the news of her grandson's birth.
[7] In addition, Stephen donated further lands in Bereg County – Szentmiklós near Munkács, Szolyva, Verecke and Kölcsény (present-day Chynadiiovo, Mukachevo, Svaliava, Nyzhni Vorota and Kolchyno in Ukraine, respectively) – to Forrói in another charter issued in 1263, for bringing him the news of the birth of his son.
[4] In exchange for Szentmiklós and Szolyva, rex iunior Stephen bestowed the villages Kécs, Fáj and Szend in Abaúj County to Forrói in 1264.
Therefore, Stephen, who ultimately defeated his father and remained de facto ruler of Eastern Hungary, confiscated the lordship of Forró (and also Orjavica) from Forrói.
[7] Stephen V donated the lordship of Forró with the surrounding villages (and other non-related estates) to his Judge royal Nicholas Monoszló in May 1271, without mentioning Forrói's previous ownership.
After the death of Stephen V in 1272, Forrói swore loyalty to Dowager Queen Elizabeth, who nominally ruled the realm as regent during Ladislaus' minority, when rivaling baronial groups fought for the supreme power.
[8][9] During that time, Forrói filed a lawsuit against Geanus (or Gyanus), a canon of Székesfehérvár and other local landowners over a disputed land laid between Szentgyörgy and Apáti in Zala County before the judicial court of Judge royal Nicholas Gutkeled.
[10] In February 1275, Ladislaus IV exempted the villages of Forró, Devecser, Fancsal and Fáj from the supremacy of the ispán of Abaúj County and placed them directly under the jurisdiction of the royal court of justice due to permanent bias.
[8][9] As part of a six-member delegation, he represented Ladislaus IV in Vienna in July 1277, when the king entered into an alliance with Rudolf against Ottokar II.
Forrói filed a lawsuit over the estate Kölcsény (which he formerly possessed) against James the Kuke (progenitor of the prestigious Lónyay family) in early 1296.
Forrói won the case for Catherine, presenting a former letter of donation of the late Duke Stephen to her mother Agnes from 1269; she ultimately was progenitress of the Fonyi family.