This was the site of one of the oldest churches in Orvieto:
✴A monastic community apparently administered a hospice here in the time of Pope Gregory I (ca. 590) [reference ??].
✴A lost document apparently recorded that Teodoro, an inhabitant of "Castri Urbb.", gave the oratory of Sant' Angelo to the Abbazia di Farfa in 767.
A small room built in tufa that was discovered near the apse in 1933 has been dated to the 5th or 6th century.
A fragmentary inscription that is now in the sacristy is dated 834 AD, in the reign of Pope Gregory IV.
A church that was built here in the 11th century, which had the privilege of a campanile and a baptistry, was recorded as a possession of the Abbazia di SS Severo e Martirio in 1297. It gave its name to one of the rioni (districts) of the city in the 12th century. An inscription in the sacristy records that it was restored and enlarged in 1333.
An inscription records that Cardinal Bartolomeo Pacca, who held the Abbazia di SS Severo e Martrio in commendum, commissioned the rebuilding of the church on 1828, and that Cardinal Bishop Antonio Francesco Orioli (1833-41) consecrated it in 1838. (This inscription says that a church dedicated to St Michael Archangel has existed here since the 7th century).
Interior
The interior has a rectangular barrel-vaulted nave with two side chapels on each side, culminating in a semi-circular, domed apse.
[Sacristy
The oldest part of the church now serves as the sacristy - where is it???
It contains frescoes (15th century) attributed to Pietro di Nicolò Baroni.
[Madonna and Child enthroned with saints (15th century)
This damaged fresco of the Madonna and Child with SS Severus and Martirius is in the sacristy.]