With the death of his father and half-brothers by Mythic Dawn assassins, Martin became the only remaining Septim.

What is known is that Martin was raised by a farmer that he lived for a substantial time in the city of Kvatch that he practiced Daedric magic for a time, and later became a priest of Akatosh. No precise date of birth within the Tamrielic calendar is known. Little is known of Martin's life before the events of 27 Last Seed, 3E 433, when his father the Emperor was killed. He appears as a character in The Elder Scrolls IV: Oblivion. He is the final Emperor of the Septim bloodline.

Martin Septim ( 3E ? - earliest 3E 433) was the illegitimate son of Emperor Uriel Septim VII, leader of The Empire of Tamriel, a fictional state in the Elder Scrolls universe. Martin Septim, in his Emperor's robes and wearing the Amulet of Kings.