One week after his birth, Minato's father, the sixth Hokage was in all out battle against his former teammate, and best friend Sasuke. At near death, Sasuke threatened to destroy Naruto's home, in which was containing his wife Hinata, and his son Minato. With only a 1/4th of his power, Naruto called forth the Shinigami, to use the Dead Soul Seal Technique. After doing so, he sealed Sasuke away forever, also saving the village and his family. But, killing himself doing so. Growing up in the Hidden Leaf Orphanage was hard for Minato, being teased due to his "strange" eyes, as the other kids said cause of his eyes being like his mother's. If you're wondering how he ended up in the Orphanage is because his mother was killed in battle against a reincarnated Hokage Canidate.