For his participation, Béla III granted the king's share (one third part) of the port duty of Szolnok along the river Tisza to Boleslaus, who also acquired the village of Kabala with the approval of the monarch. Later, Boleslaus handed over this land to his nephew, Marhard in exchange for his portion at Lelesz. Boleslaus also owned a settlement, Árpád in Bihar County (present-day Arpășel, Romania), which he exchanged for the village of Kanyár in Szabolcs County with Lawrence, abbot of Gyulamonostor (today Mănăstirea, Romania) with the approval of Vata (or Wasca), the Bishop of Várad. Boleslaus was first styled as Bishop of Vác in 1188, when Béla III donated the third quarter portion of the local fair duty to the cathedral chapter of Esztergom. However this royal charter proved to be a forgery, although its list of dignitaries – where Boleslaus' name appeared – is reliable. Boleslaus was first referred to as bishop by an authentic document only in 1193. His last known predecessor was Job, who held the position a decade earlier and was later elevated into the Archdiocese of Esztergom. Immediately after his election, Boleslaus requested the permission of Pope Celestine III to hold annual diocesan synods on 8 September (Nativity of Mary), who approved in 1193. In order to financially support his bishopric, Boleslaus waived his share (a quarter, called "quarta episcopi") of the tithe in favor of the lower clergy and vicars. According to a royal charter of Béla IV of Hungary (r. 1235–1270) issued in 1252, Boleslaus founded the monastery of Lelesz on his own possession sometime in the early 1190s, the last regnal years of Béla III. The bishop invited Premonstratensian monks to Hungary, and the new monastery directly connected to the religious order's mother house, the Prémontré Abbey as its filial church. The circumstances of the foundation was preserved by a royal charter of Andrew II, issued in 1214. In this document, the king recorded the second last will and testament of Boleslaus, who died prior to that, and listed his donated lands and properties in favor of the Lelesz provostry.