See this legally free ebook:

  • The Letters of S. Ambrose, with Notes and Indices (Oxford: James Parker & Co.; London, Oxford, Cambridge: Rivington, 1881). May be read online, and available in pdf, kindle, epub, daisy, djvu, and text formats, at Internet Archive and Open Library, with a second copy at Internet Archive and Open Library [N.B., This appears to be among the most extensive collection available online of letters from the great Doctor and Father of the Church. Please take note of Letter LII reporting to the Pope the results of the Synod of Milan (AD 389), which affirmed the ancient Christian teaching on the virginity of the Blessed Mother.]

On the Feast of Saint Ambrose (c.340-397 AD), Bishop of Milan, in the one true Church. For other legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject). Blessed be God in His angels and in His saints!

“Let them give credit to the Creed of the Apostles, which the Roman Church has always kept and preserved undefiled.” (St. Ambrose and the Synod of Milan, Letter LII, 5)