Amadeus and his brothers inherited their estates from their father in
Gút in
Fejér County (present-day a borough of
Isztimér), the neighboring lands
Marcaltő,
Malomsok and Szente at the confluence of
Marcal and
Rába in the borderland of
Veszprém and
Győr counties, in addition to
Bagamér in
Bihar County. As a noble from
Transdanubia, Amadeus came to prominence in the autumn of 1272, when the minor King
Ladislaus IV ascended the Hungarian throne under the guardianship of his distant relative
Joachim Gutkeled, which marked the beginning of the era of feudal anarchy. Amadeus was installed as
ispán of Vas County in September 1272. In this capacity, he played a prominent role in the emerging Bohemian–Hungarian War. He took part in defending the western border region, when
Ottokar II of Bohemia sent troops to plunder the surrounding region, which affected mostly
Slavonia and Vas County. In early February 1273, Amadeus was among those lords, who led the Hungarian incursions into
Austria and
Styria, alongside
Matthew Csák, Joachim Gutkeled,
Ivan Kőszegi and
Denis Péc. Amadeus commanded the contingent of
castle warriors from Vas County during the incursion to Styria. He was present at the siege of
Fürstenfeld. Meanwhile, he was replaced as
ispán around May 1273, when Dowager Queen
Elizabeth the Cuman temporarily took control of the royal council on behalf of his minor son Ladislaus, after Ottokar II invaded the Kingdom of Hungary in April. (Felsőlendva) in
Slovenia Amadeus returned to the royal court as
ispán of Vas County in August 1275, when the
Kőszegi–Gutkeled baronial group retook power after an absence of three quarters of a year. He lost the position by December 1275, when the rival
Csák-dominated group again dominated the royal council. However, Amadeus soon switched sides and reconciled with the Csák government in the winter of 1275. Therefore, Amadeus was granted the castle of
Felsőlendva (or simply Lendva, present-day Grad,
Slovenia) and its accessories in Vas County by Ladislaus IV on 10 December 1275. The royal charter mentions Amadeus' services during the reign of Kings
Béla IV and
Stephen V without specifics. Amadeus purchased the castle and its area from Solomon Dárói for 300 silver
marks (Amadeus paid only 250, the remaining 50 was added by his son in 1308). Sometime in the first half of 1276, he was also appointed
ispán of Zala County. The Csáks were deprived from power in June 1276 at the latest, because
Peter Csák plundered the territory of the
Diocese of Veszprém with brutal means. Amadeus, now belonging to them, also lost his office, when the Csáks' enemies, including Amadeus relatives, summoned a
diet (
communis congregatio) to
Buda. There, on 21 June 1276, a verdict stated that sometime before, Amadeus looted and destroyed two villages,
Monyorósd and
Szőce in Vas County possessed by
Andrew Nádasd, the Count of the Royal Armour-Bearers (). As a compensation, Ladislaus IV confiscated the village
Gógánfa in Veszprém County from Amadeus and donated it to Andrew Nádasd. Since the date of the charter is only partially legible, many historians have placed the year of issuance at 1286, which, however, contradicts the temporal circumstances of Amadeus' death (see below). After 1276, Amadeus' name disappears from sources. He was deceased by 18 June 1286, when Ladislaus IV assured his widow and orphans that he would confirm all the royal donations he had once made in his favor, and promised to confirm the donations with a
golden bull at an opportune moment if the situation in the realm improved. His widow was still alive in 1332; in that year, she chased the parish priest out of his church in Ság (near
Iharosberény) in
Somogy County. ==References==