The city has been honoring St Michael since its very beginnings. The oldest sacral building in its in its center was therefore devoted to this heavenly guardian.

Having in his assistance, strength and protection, the residents of Šibenik used his figure, symbolizing fearlessness and victory, in their city seal and coat of arms. This was their way of demonstrating the strength of the municipality, which was to follow their patron's example and constantly win in the battle for preservation of their rights.

This saint has been honored and celebrated all over the diocese throughout the centuries. Churches in Murter, Raslina, Kijevo, Mitlo, Vršine by Dubrava, Pokrovnik,Oklaj and Lišani were built in his honor.

St Michael is the most popular heavenly archangel. His name, translated from Hebrew, means “He who is like God”. He has been respected in the Western church since VI century when, as legend has it, he appeared on Monte Gargano in Apulia . He is celebrated on 8 May and 29 September. For Šibenik it is the latter date, also proclaimed the Day of the City, that is filled with festivities.

The holiday St Michael has been celebrated solemnly in Šibenik throughout the centuries. Many important town events happened on the day of the town's patron. In a document dating back to 1252, when the habitants of Šibenik recognize the jurisdiction of the Trogir bishopric, it is mentioned that believers on the holiday of st Michael brought bread, money, candles and wine. A well known Šibenik poet, Juraj Šižgorić notes that on that day prayer is held, nobility and craftsmen bring candles in honor of the saint, whereas a citizen was welcomed in the town senate.

Every year on the patron's day in September a nobleman would be accepted into the town council, and also it was common that a prisoner would be released. On the 12 th of March 1453 the town council decreed that on certain holidays including St Michael's day no trading was allowed in the town ,fortress , or in the district except for small things that were necessary for food.

A very serious penalty was enforced to those who forged the seal of St Michael; the punishment was amputation of the right hand and banishment from the town and its district.

The portrait of St Michael is preserved on many historical works of art; paintings, sculptures, and on buildings, which proves how much this patron was respected and worshiped in Šibenik and the Šibenik bishopric.

Alongside many emblems and seals with the picture of St Michael , the significant ones can be seen on historical paintings, like the ones on the polychrome from the church St Grgur painted by a well-known Šibenik artist from the 15c Nikola Vladanov; the polychrome from the church of St Krševan ;in the codex of Bishop Kosirić, and it can be found on the Šibenik bagatin (local Šibenik currency from the 15c); it also can be traced on the statute of the town of Šibenik from 1608 ; on various liturgical objects; on altars and as well as on many modern works of art.

The town patron is overlooking the town of Šibenik, while trampling on Lucifer thus slaying him with a spear with his wings spread out.