Dīn in the context of "Ad-Din"

Muhammad (c. 570 – 8 June 632 CE) was an Arab religious, military and political leader and the founder of Islam. According to Islam, he was a prophet who was divinely inspired to preach and confirm the monotheistic teachings of Adam, Noah, Abraham, Moses, Jesus, and other prophets. He is believed by Muslims to be the Seal of the Prophets, and along with the Quran, his teachings and normative examples form the basis for Islamic religious belief.

According to the traditional account, Muhammad was born in Mecca to the aristocratic Banu Hashim clan of the Quraysh. He was the son of Abdullah ibn Abd al-Muttalib and Amina bint Wahb. His father, Abdullah, the son of tribal leader Abd al-Muttalib ibn Hashim, died around the time Muhammad was born. His mother Amina died when he was six, leaving Muhammad an orphan. He was raised under the care of his grandfather, Abd al-Muttalib, and paternal uncle, Abu Talib. In later years, he would periodically seclude himself in a mountain cave named Hira for several nights of prayer. When he was 40, in c. 610, Muhammad reported being visited by Gabriel in the cave and receiving his first revelation from God. In 613, Muhammad started preaching these revelations publicly, proclaiming that "God is One", that complete "submission" (Islām) to God (Allāh) is the right way of life (dīn), and that he was a prophet and messenger of God, similar to other prophets in Islam.

Mohyeddin is an Arabic name meaning "Reviver of Dīn". It is used both as a personal name for males and as an honorific title in the Islamic tradition. Several notable figures, including scholars, philosophers, and theologians throughout Islamic history, have been known by this name.