1905 - Prince Gavyn is born the Crown Prince of Throneworld.
1928 - 23-year-old Gavyn is betrayed by his royal advisers & is cast to Earth through a wormhole.
1932 - 27-year-old Gavyn, posing as an earth scientist, creates his Cosmic Rod & becomes the first Starman.
1939 - WW2 begins.
1941 - After the attack on Pearl Harbor, The Justice Society is formed, including 36-year-old Gavyn.
1945 - WW2 ends.
1948 - 43-year-old Gavyn returns to the Throneworld with the Justice Society. He finally defeats his usurpers & installs his sister on the throne before returning to earth.
Swapping Prince Gavyn and Ted Knight's place is one of the larger changes we've made to the timeline. We've kept Ted's costume, as it's a fantastically period-appropriate costume for a world war era superhero, but in order for Ted's children to be contemporary heroes he really needs to be a part of our new All-Star Squadron.
Meanwhile, Prince Gavyn's story actually winds up transposing into Ted's Justice Society position surprisingly well. The only real difference was the notion that Gavyn develops real loyalty to earth, so much so that when he retakes the Throneworld he abdicates the throne to his sister. Combining that story with the very particular look of Ted Knight's costume, and you get a very specific notion of who the character is. He becomes a fantastic beginning to the legacy of Starmen.