Dragon Lord (The Dragon Lord)

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You may be looking for Dom-Ra, the Dragon Lord on Kamshassa.

An unnamed man come to a planet where the colony ship crashed and created a medieval society with space-age technology, becoming known as a cup boy named Craig. After his "death", he chose to become the Dragon Lord, a "terrorist" and "dragons' rights activist". He freed the enslaved dragons on the planet, which then attacked and killed the royal family in the Red Castle. He sent holographic messages warning the human colonists that they would be hunted next and mined the area with traps, but was killed inside the Red Castle trying to befriend the dragons. (COMIC: The Dragon Lord)