D'Ken

History:

When the former Shi’Ar Emperor passed away, his son D’Ken, the second hatchling, was named ruler and led the Shi’Ar with a forceful hand. It is unknown when his rulership began; his earliest documented appearance are flashbacks of about twenty years in the past, when Shi’Ar troops captured Christopher and Katherine Anne Summers as earth specimens (Uncanny X-Men #156).

D'Ken kept Katherine Summers as a concubine. It is rumored that these are the parents of Adam-X, the so called "Third Summers Brother." When Christopher Summers attempted to rescue his wife, D'Ken killed her before his eyes.

Later D`Ken thought to explore the power of the M’Kraan Crystal, but his younger sister Lilandra, serving as a Grand Admiral, opposed him. He framed Lilandra for treason and condemned her to death, but she escaped and made her way to Earth, where she enlisted the help of the X-Men. They made their way to the crystal just in time to repair it before it would have erased the entire universe, but after D’Ken was exposed to it’s nightmare field, he went insane and fell into a catatonic state (Uncanny X-Men #107-109).