Robert Plant wrote "I Believe" about his son, Karac, who died from a stomach virus on July 26, 1977, at five years old. Plant explained this to journalist Dan Rather during a 2018 episode of Rather's series The Big Interview
Karac's death devastated Plant, of course. It also spelled the beginning of the end for Plant's band, the legendary Led Zeppelin.
Plant received the news shortly after arriving in New Orleans, where Zeppelin was supposed to play a show. He later claimed that he gave up all drugs in that precise moment and never looked back - he didn't want the party lifestyle anymore and lost interest in being a rock star. He just wanted to be with his family.
During the soul searching that followed, Plant considered teaching at a Rudolph Steiner Waldorf
school. Zeppelin guitarist Jimmy Page ended up talking Plant out of retiring from music altogether.
The band only lasted a couple more years, however. The 1980 death of drummer John Bonham sparked the final breakup, but in many ways Plant never fully invested himself back into the group.