Lampert was born into the Kóvár (or Csalomja) branch of the wealthy and prestigious gens (clan) Hont-Pázmány as one of the four sons of comes Nicholas I.

Lampert was also granted three villages with port duties along the river Tisza, including Csege and Örvény (present-day a borough in Tiszafüred), in addition to the Ohat Abbey in the western part of Hortobágy.

Lampert was permitted to build a stone castle in Füzérkő (also known as Kerekkő), near present-day Bükkzsérc, which laid in the Bükk Mountains.

[4] King Béla IV entrusted the Knights Hospitaller to settle Cumans in the territory of the Diocese of Eger to make up for a population drastically reduced during the Mongol invasion.

[4] The monarch confirmed all previously granted land donations, income, benefice, privileges for the Diocese of Eger in September 1261, upon the request of Lampert.

[4] After Béla's son, Stephen ascended the Hungarian throne, Lampert requested the monarch to transliterate and confirm his father's aforementioned privilege letter in 1271.

[5] Contemporary sources confirmed that Lampert occasionally tried to extend his diocese's influence to the detriment of neighboring or privileged ecclesiastical institutions.

Lampert persuaded the friars to hand over their tithe associated with viticulture to the diocese despite their privilege, which was provided by Pope Clement IV years earlier.