Jacob (Iacob in Latin) is a fictional character of the ABC television series Lost played by Mark Pellegrino. He was first mentioned as the true leader of the Others by Ben Linus and was described as a "great man" that was also "brilliant", "powerful" and "unforgiving". He made his first appearance in the final episode of season five. Despite being killed in that episode, he continued to appear as a spirit, as well as in flashbacks in the episodes "Ab Aeterno" and "Across the Sea". Being an unseen character for much of the series, Jacob is revealed to have been the agent responsible for the plane crash in response to a conflict with his nemesis and brother, The Man in Black. He has been the protector of the island for millennia and has been referred to as "the man in charge." In some of his appearances, Jacob has shown supernatural powers including immortality, healing, omniscience, and changing peoples' destiny to suit his goals. Due to these powers, he has had a considerable influence on the lives of several main characters including Jack Shephard, Kate Austen, John Locke, James "Sawyer" Ford and Hugo "Hurley" Reyes. Before the crash of Oceanic Flight 815 Jacob's earliest chronological appearance is in the sixth-season episode "Across the Sea" where he is born to a Roman woman named Claudia, who was shipwrecked on the island sometime in the 1st century. Claudia also gave birth to Jacob's brother, otherwise known as The Man in Black. She was then murdered by the female protector of the Island, who then raised the brothers. Jacob was clothed in light cloth, a trademark of his that continued into adulthood. They were told that there was no life outside the island and that it was just them. They were also told about a mysterious light that eventually one of them had to protect. Eventually, the Man in Black discovered that their "mother" had lied to him and told Jacob that she was not their mother, but they belonged to a group of people who had arrived on the island with their biological mother. Jacob loved his mother too much and did not want to believe this. He ended up staying with his mother for the next 30 years, while the Man in Black lived with his people, though the brothers stayed in contact. The Man in Black and his people were about