St. Ambrose of Milan

Old Testament: Isaiah 24:1-13
New Testament: 1 John 1:1-2:14
Psalms: Morning - 102
Evening - 130; 16

"It is not the ambassador, it is not the messenger, but the Lord Himself that saveth His people. The Lord remaineth alone, for no man can be partner with God in forgiving sins; this office belongs solely to Christ, who taketh away the sins of the world." - St. Ambrose

O Blessed Light, O Trinity (LSB 890) Verse 3:
"All glory be to God above
And to the Son, the Prince of love,
And to the Spirit, One in Three!
We praise You, blessed Trinity. - Text by St. Ambrose

A detailed account of the life and works of the saint can be found here. God gave to him the gift of writing and preaching. Most people in the West know him because he also had a tremendous impact in the life of St. Augustine of Hippo, who through God's grace became a Catholic rather than a Manichaean and became one of the greatest of the Western theologians and fathers of the church. Aside from the hymn quoted above, he also wrote the text for "Saviour of the Nations, Come."

Collect: O God, who graciously gave Your servant Ambrose eloquence to proclaim Your righteousness and fearlessness to bear reproach for the honor of Your Name, mercifully grant to all pastors and overseers such excellence in preaching and faithfulness in ministering Your Word that Your people may be partakers with them of the glory that shall be revealed; through Jesus Christ our Lord, who lives and reigns with You and the Holy Spirit, one God, now and forever. - Taken from Aardvark Alley :-).

Orthodox Apolyptikion: The truth of things hath revealed thee to thy flock as a rule of faith, an icon of meekness, and a teacher of temperance; for this cause, thou hast achieved the heights by humility, riches by poverty. O Father and Hierarch Ambrose, intercede with Christ God that our souls be saved.