The series initially ran from 1966 to 1982, dealing with the long-past events of an empire on the distant planet of Elekton. Heaverly influenced by mythological tales, a number of the societies seemed to be based on ancient cultures that had existed in history. Chief among these was the Trigan Empire, apparently modelled on the Roman Empire.
The first strip told of a spaceship crashing into a swamp on Earth, the crew frozen to death, with many written volumes inside in an unknown language. Studies of the crew reveal them to be humanoid, but around 12 feet tall. After many years, the spaceship is turned into the central attraction of an amusement park. Eventually, at a very advanced age, a scientist - Peter Richard Haddon - who has studied the books from the spaceship as a young man manages to decrypt the volumes, and begins to relate the tales.
The strip first appeared in the first issue of the British magazine Ranger in September 1965 and then in the British Look and Learn magazine magazine from issue 232 (June 1966) when the two titles merged after the 40th issue of Ranger. Both titles were weekly educational magazines designed for young people, although mainly filled with articles on life, history, science and technology, both contained a small comic strip section in each issue.
https://en.wikipedia.org/wiki/The_Trigan_Empire