Which preposition to use with silla

by Occurrences 1%

But Baini exposes Pitoni's carelessness, proves the existence of Ridolfo and Silla by the inclusion of their works in the father's book, and shows that Doralice was the wife of Palestrina's son Angelo.

of Occurrences 1%

I had not even the chance of such a view as that from the Silla of Caraccas described by Humboldt, from which you look down at a height of nearly six thousand feet, through layer after layer of floating cloud, which increases the seeming distance to an awful depth, upon the blazing shores of the Northern Sea.

Which preposition to use with  silla