Christian feast day: Martin Chemnitz (Lutheran)

Martin Chemnitz was an eminent second-generation German, Evangelical Lutheran, Christian theologian, and a Protestant reformer, churchman, and confessor. In the Evangelical Lutheran tradition he is known as Alter Martinus, the "Second Martin": Si Martinus non fuisset, Martinus vix stetisset goes a common saying concerning him. He is listed and remembered in the Calendar of Saints and Commemorations in the Liturgical Church Year as a pastor and confessor by both the Evangelical Lutheran Church in America and Lutheran Church–Missouri Synod.

Lutheranism is a major branch of Protestantism that emerged under the work of Martin Luther, the 16th-century German friar and reformer whose efforts to reform the theology and practices of the Catholic Church launched the Reformation in 1517. The Lutheran Churches adhere to the Bible and the Ecumenical Creeds, with Lutheran doctrine being explicated in the Book of Concord. Lutherans hold themselves to be in continuity with the apostolic church and affirm the writings of the Church Fathers and the first four ecumenical councils.