Episode 72 of The Trigan Empire
De keizer-rivaal (Dutch title)
The Emperor Rival (Dutch title, translated)
Written by Ken Roscoe
Illustrated by Gerry Wood
The Rival was originally published in 8 instalments in issues 844 (18 March 1978) to 851 (6 May 1978) of Look and Learn magazine.
To date it has not been reprinted in English.
Plot summary (Dutch)
MediaFire via British Comics Compilations