Jacob was an orangutan who lived in Ape City during the mid 21st century. He was the son of noted pedagogue Virgil and became a close confidante of Ape City's ruler, Alexander, but was reluctant to allow any rights to humans. Jacob accompanied Alexander on a special expedition into the Forbidden Zone. He saved Alexander's life when a throng of mutants leapt from the catacombs and attacked them.
- Jacob is exclusive to the continuity of the Planet of the Apes comic books published by Malibu Graphics.
- The character of Jacob was created by writer Charles Marshall.
- Jacob's role as an author of the 'Sacred Scrolls' is acknowledged in the 2018 novel Death of the Planet of the Apes.
- Planet of the Apes (Volume 1) #1 (1st appearance)