Blessed Eusebius of Esztergom (Hungarian: Esztergomi Boldog Özséb; Polish: Euzebiusz z Ostrzyhomia; German: Eusebius von Gran; c. 1200 – 20 January 1270) was a Hungarian canon, hermit and the founder of the Order of Saint Paul the First Hermit.

At that time Eusebius was often visited by hermits from the Pilis Mountains who sold him wattled baskets in exchange for bread.

From the cross he heard the words: "“Eusebius, summon all the hermits and found a monastic community.

His first route led him to the hermits of Jakab-hegy, Baranya County who since 1225 lived according to the Regula of Bartholomew le Gros, the Bishop of Pécs.

"[3] On the 1256 National Council of Esztergom, Eusebius wrote his name as the First Provincial of the Order of Saint Paul the First Hermit.

In 1262 he went to Rome with his companions to meet Pope Urban IV to ask him for approval for founding his own order.

The pope first refused to give Eusebius his permission because of financial conditions and asked Paul Balog, the Bishop of Veszprém to examine the monasteries.

[5] Papal legate Cardinal Gentilis de Monte Florido gave the order the Rule of St Augustine, and it received approval with the decree ‘Qui saecularia’, issued in Buda on 13 December 1308.