Hasan ibn Ali 
Prophet SAW hoped that Hasan will unite Muslims, and he did.
Muawiyah was considered to be the best and just king.
Hasan was chosen as Caliph in the month of Ramadan in Kufa
Hasan was known to be the last Khulafa Ar-Rasheed
Muawiyah sent two noble companions to Hasan during fitna times: Abdullah ibn Amr and Abdur-Rahman ibn Samura. They offered Hasan peace; therefore, he accepted and returned to Madinah.
The conquests were stopped during fitna times (6 years), so they were continued after peace treaty.
Hasan's paternal aunt was Umm Hani' bint Abu Talib
Shia claim that Ali, Hasan and Hussein (there are others too) are infallible which is not acceptable by Ahlu-Sunnah.
Ali was killed in Ramadan, 40 AH
Conflicts and fitna took place in 41 AH and continued for about six years
Was said to have died maybe in the year 49, 50 or 51 AH. So probably passed away at the age of 47
Othman was killed in the year 35 AH
Baby Hasan rod Prophet's SAW back while he was leading prayer
Muslims were ready to fight Khawarij
Nabi SAW said this reign would last for 30 years after his death. Then would be followed by the reign of 'clinging' kings.
People of Kufa loved Hasan more than Ali
Hasan was Caliph for seven months
Hasan gave Caliphate to Muawiyah in Rabi Al-Awwal or Rabi' Ath-Thani, 41 AH
Thus the prophecy of Nabi SAW came true
He was merciful and generous
He was not weak for giving power to Muawiyah, but he wanted to stop bloodshed. A lot of people disliked him for doing that but he never regreted.
Muawiyah used to send gifts to Hasan and Hussein
Hasan had the most closest resemblance to Nabi SAW, and even in morals and traits.
Muawiyah gave Hasan 400,000 dirhams which was not given to anyone but him
Omar gave some share to Hasan and Hussein from the Battle of Badr.
Abu Bakr made a poem about Hasan out of love for him.
Hasan married more women than Hussein
The descendants of Hasan exceed the descendants of Hussein in our world right now.
Hasan hated killing and fighting
He performed pilgrimage 15 times by walking from Madinah to Makkah
Was eloquent speaker like Ali
Hasan wished to be buried inside the chamber of our Mother Aisha and she accepted it, but Marwan objected. Hussain and Marwan started arguing.
He passed away when he was either 47 or 48
He used to help people without reading papers they give where they mentioned money, etc. 🚩
Marwan ibn Hakam objected saying how come Othman was buried in Baqi Cemetery and Hasan inside the chamber of Aisha
In order to avoid turmoil, Hasan was burried in Baqi as well. He was buried next to his mother, Fatimah.
There are 320 saying of Nabi SAW from Hasan. 9 in Bukhari and 20 in Muslims' sahihs.