I want to know the answer to the following question:
Who was the third caliph?
All the background I'm provided with is that "The Umayyad family had first come to power under the third caliph, Uthman ibn Affan (r. 644–656), but the Umayyad regime was founded by Muawiya ibn Abi Sufyan, long-time governor of Syria, after the end of the First Muslim Civil War in 661 CE/41 AH.". Is that enough to answer the question?
Answer: yes