రాజన్న!
He was catapulted to prominence in state politics after his padyatra during the campaign for the 2004 Assembly elections which eventually led to the Congress coming to power in the state after a long time.
Today, on his father's birth anniversary, the first since YSR's death in a helicopter crash last year, his son Jagan begins his Odarpu yatra, to honour his father's memory, from Srikakulam.
Here's a look back at the life and times of a mass leader.
His father, Y S Raja Reddy, was a dynamic mass leader and YSR had an interest in politics from the time that he was a student.
YSR did his schooling in Balapanur and Bellary, where his father worked.
YSR entered active politics in 1978 and was elected five times to the state Assembly. And four times to the Lok Sabha. He never lost an election. During his 25-year-long political career, YSR was president of the Andhra Pradesh Congress Committee (APCC) twice, he held several important portfolios as minister and from 1999 to 2004, served as Leader of the Opposition in the Andhra Pradesh Assembly.
A year later he led his party to victory in the state elections and became Chief Minister. YSR burst onto the national stage with his padyatra during the campaign for the 2004 Assembly elections. Many saw him as the centerpiece of the Congress strategy against the all-powerful TDP.
YSR expanded his political empire from Andhra Pradesh's feudal Reddy heartland. He won 4 Lok Sabha and 4 Assembly elections from Kadappa. He was credited publicly and often with being a leader with a huge mass base, a rarity in the Congress party. He was particularly popular for his welfare schemes, which found no match around the country.
YSR's body was found along with four others atop the Rudrakonda hill. Commandos reached his helicopter 24 hours after it crashed.
The helicopter went missing after it lost contact with the Air Traffic Control (ATC) in Chennai - an hour after it took off from the Begumpet Airport in Hyderabad.
Supporters of deceased Andhra Pradesh Chief Minister Y S Rajasekhara Reddy paid their last tribute to the departed leader during his funeral procession in Hyderabad.