Beethovens third and fourth piano concertos were written in 1800 and 1809 respectively. The fourth is the more popular among the two, and in fact is one of the best known in the repertoire. It was not always so though. In 1809 it was to be the last concert Beethoven played himself, and after that it would have been all but forgotten if not for the efforts for Mendelssohn in 1836.
Gilels and the Cleveland orchestra under George Szell are a nice combination, if a bit light. This is well recorded material, created in 1970. Before he suffered a heart attack after a concert at the Concertgebouw in Amsterdam, in 1981. His health was never the same after that. He was about to do a run of the Beethoven sonatas when he died in 1985.