On the base of the spire located in the middle of S.Bartolomeo square, on the East side facing the church fašade, there is this inscription that commemorates the spire erection in 1869 by Pope Pio IX at his own charge in the place of an ancient column damaged by a cart impact.

This is the text:

PIUS IX PONT. MAX
IN COLUMNAE LOCUM
QUAE PLAUSTRI IMPETU
QUASSATA CONCIDERAT
PECUNIA SUA
FIERI ERIGIQUE IUSSIT
ANNO CHRISTIANO
MDCCCLXIX
CONCILIO VATICANO
INEUNTE

[Pio IX Pontifex Maximus, in the place of the column that fallen pulled down by a cart impact, ordered (this spire) to be built and erected at his charge. Christian year 1869, beginning of Vatican Council]