Which preposition to use with sordello

as Occurrences 1%

The point is that Dante in the Purgatorio represents Sordello as showing to Virgil the souls of those who, while singing Salve Regina, ask to be pardoned for their neglect of duty and among them appear the rulers whom Sordello had satirised in his sirventes.

on Occurrences 1%

The first is a sirventes composed by Sordello on the death of his patron Blacatz in 1237.

Which preposition to use with  sordello