Yadigar Muhammad (died 1470) was the Timurid ruler of Herat in opposition to Husayn Bayqarah for a portion of 1470.

Yadigar Muhammad was born to Sultan Muhammad, who was a grandson of Shah Rukh. It was his family ties that caused Uzun Hasan, sultan of the Ak Koyunlu confederation, to hand over to him Abu Sa'id after capturing him in 1469. Abu Sa'id, who had previously ordered the execution Shah Rukh's wife, was killed by Yadigar Muhammad.

Later in 1469, Uzun Hasan had Yadigar Muhammad proclaimed as Abu Sa'id's successor and provided him with Timurid forces so that he could take over Khurasan, which was then controlled by Husayn Bayqarah. Although Yadigar Muhammad was defeated by Husayn in battle in September, fresh reinforcements were sent by the Ak Koyunlu leader. Furthermore, two of Uzun Hasan's sons arrived to assist him. Eventually Husayn was compelled to evacuate Herat, which Yadigar Muhammad occupied in July 1470. Despite this, his troops were unreliable and Husayn reentered Herat six weeks later. Yadigar Muhammad, who was captured, was promptly executed by his enemy. He was the last descendant of Shah Rukh to play a dominant role in the politics of the Timurid principalities.

Muhammad (c. 26 April 570 – 8 June 632; also transliterated as Mohammad, Mohammed, or Muhammed; Arabic: محمد‎), full name: Muhammad Ibn `Abd Allāh Ibn `Abd al-Muttalib (Arabic: محمد بن عبدالله بن عبد المطلب ‎) was a leader from Mecca who unified the tribes of Arabia into a single religious polity under Islam. He is believed by Muslims and Bahá'ís to be a messenger and prophet of God. Muslims believe that Islam was not his own invention but was revealed by God, and most consider him to be the last prophet of God Muslims thus consider him the restorer of an uncorrupted original monotheistic faith (islām) of Adam, Noah, Abraham, Moses, Jesus and other prophets.

Born in 570 CE in the Arabian city of Mecca, he was orphaned at an early age and brought up under the care of his uncle Abu Talib. He later worked mostly as a merchant, as well as a shepherd, and was first married by age 25. Being in the habit of periodically retreating to a cave in the surrounding mountains for several nights of meditation and prayer, he later reported that it was there, at age 40, that he received his first revelation from God. Three years after this event Muhammad started preaching these revelations publicly, proclaiming that "God is One", that complete "surrender" to Him (lit. islām) is the only way (dīn) acceptable to God, and that he himself was a prophet and messenger of God, in the same vein as other Islamic prophets.