About the death of Clement of Osimo, Henry of Friemar O.S.A
. wrote, "As in life so at his death, which occurred at Orvieto, and in the presence of the papal curia and all the cardinals, in the time of Pope Nicholas IV, he became well known for his great miracles.
Because of the miracles, he was not buried for many weeks by order of the pope, who declared that it would be unworthy that a body of such a holy person should be covered by earth."
"So large a multitude came thronging to view the extraordinary body, and the press of the people was so great that the government of Orvieto decided to demolish many houses, in order to widen the street and give better access for the crowd that sought to go to the house of the Augustinians."
"Although the weather was very warm, the body gave forth no odour of corruption but rather a sweet fragrance, as attested to by the lord cardinal Benedict, who had Clement as his confessor and, out of devotion, paid many visits to the body. He later became Pope Boniface VIII."
The cultus (the formal process for declaration as a saint) of Clement of Osimo began at once.
In the seven and a half centuries of the history of the Order of Saint Augustine, there is no other example of a superior whose holy nature was proclaimed, as in the case of Clement, in the official chapter records of the Order.
The members of the three general chapters following Clement's death called him a "saint", and recalled his memory as a legislator of the Order, particularly in his work with the Constitutions of Ratisbon.
It is not possible to explain why it was not until 1759 that the cultus of Clement was officially conveyed by the Order to the Holy See, and approved in 1761.
The Augustinian family celebrates his feast on 19th May, together with Blessed Augustine of Tarano
(a.k.a. Agostino Novello).
The lifespan and location of Clement of Osimo much overlapped that of the first officially declared saint of the Order of Saint Augustine, Nicholas of Tolentino
Most probably these two Augustinians knew one another personally, for Clement was the provincial superior of Nicholas from 1266 to 1271, and immediately after that was his Prior General.
As Prior General Clement had visited Augustinian houses as far afield as France, hence it is highly probable that between 1272 and 1274 he visited his area of origin and former ministry, the Province of the Marches of Ancona.
Clement died at Orvieto in that area in 1291, and Nicholas fourteen years later at Tolentine in 1305.