The original Shining Knight (Sir Justin) debuted during the Golden Age and Modern Age of Comic Books and is a founding member of the Seven Soldiers of Victory.
Gardner Grayle, who would later become the Atomic Knight, took an experimental suit of armor and called himself Shining Knight for this one mission. This version of the Seven Soldiers with Batgirl, Deadman, Metamorpho, Blackhawk, Adam Strange and Mento only served in one mission and the Shining Knight armor was destroyed.
In the 1996 miniseriesKingdom Come, there is a background character named Shining Knight II. This version is more futuristic than his predecessors and comes with a giant, metal dragon named Dragonknight.[3]
Titans Tomorrow
An older version of Ystina has appeared in Teen Titans (vol. 3) #52 as a member of the Titans Army from the Titans Tomorrow future.[4]
JLA: Another Nail
The Shining Knight and Victory made a brief appearance in Elseworlds' JLA: Another Nail when all time periods meld together.[5]
^Cowsill, Alan; Irvine, Alex; Manning, Matthew K.; McAvennie, Michael; Wallace, Daniel (2019). DC Comics Year By Year: A Visual Chronicle. DK Publishing. p. 303. ISBN978-1-4654-8578-6.