Based on the 1964-1969 animated television series "Linus the Lionhearted", which was based on the Post Cereal advertising characters Linus the Lionhearted, Sugar Bear, Lovable Truly, So Hi, and Rory Raccoon.
"Linus the Lion-Hearted" is the indicia title. The cover title is "Linus the Lionhearted" (without the hyphen), which is more correct as that is how the TV show spelled it.