Then existing, passed into the hands of a Count Arconati, who presented them to the Ambrosian library at Milan in 1636.
In that year, however, Angelo Mai discovered in the Ambrosian library at Milan a palimpsest manuscript (and, later, some additional sheets of it in the Vatican), on which had been originally written some of Fronto's letters to his royal pupils and their replies.
They were further to recite the Ambrosian office.
His nephew, Federigo Borromeo (1564-1631), was archbishop of Milan from 1595, and in 1609 founded the Ambrosian library in that city.
In the Ambrosian rite the rogations take place after Ascensiontide, and in the Spanish on the Thursday to Saturday after Whitsuntide, and in November (Synod of Girona, 517).
The Hexaplar text of the LXX., as reduced by Origen into greater conformity with the Hebrew by the aid of subsequent Greek versions, was further the mother (d) of the Psalterium gallicanum - that is, of Jerome's second revision of the Psalter (385) by the aid of the Hexaplar text; this edition became current in Gaul and ultimately was taken into the Vulgate; (e) of the SyroHexaplar version (published by Bugati, 1820, and in facsimile from the famous Ambrosian MS. by Ceriani, Milan, 1874).
The political events of 1808 necessitated his withdrawal from Rome (to which he had meanwhile returned) to Milan, where in 1813 he was made custodian of the Ambrosian library.
On the Ambrosian ritual see LITURGY; on the Ambrosian library see LIBRARIES; on the church founded by him at Milan in 387 see MILAN.
The gospel and epistle are still read from the ambo in the Ambrosian rite at Milan.
It was corrupted to abilior by omission of the h and confusion of t and 1, and this corruption, which is attested by the oldest extant copy, the Ambrosian palimpsest, was still further corrupted in the other copies to agilior.