Val-Lor
From superman.nu: Supermanica
Val-Lor
Val-Lor, a valiant Kryptonian who, by courageously speaking out against the Vrangs, a "ruthless swarm of alien invaders" who had invaded Krypton and enslaved its people, inspired his fellow Kryptonians to revolt against their alien oppressors and drive the aliens from their planet.
Surviving Kryptonians Superman, Supergirl, and those in the bottle city of Kandor remember the anniversary of Val-Lor's heroism by telling the truth all day - no matter the cost (S No. 176/3, Apr 1965: "Superman's Day of Truth").