1. Hazrat Sayyidina Abu Bakr Siddique, may Lord Almighty be pleased with him,
2. Hazrat Sayyidina Umar Farooq, may Lord Almighty be pleased with him,
3. Hazrat Sayyidina Usman Ghani, may Lord Almighty be pleased with him,
4. Hazrat Sayyidina Ali, may Lord Almighty be pleased with him.
(Yes, there will be people for whom it is new information.)