Gargoyles: Dark Ages
Gargoyles: The Dark Ages, often abbreviated to The Dark Ages or simply Dark Ages, was one of six proposed spin-offs, a prequel to Gargoyles taking place in Wyvern, Scotland in the years between 971 and 994. It was pitched to CBS, but not picked up.[1]
Dark Ages would have been set at Castle Wyvern, beginning when it was built in 971, upon Kenneth II becoming King of Scotland. It would deal with the beginnings of the alliance between the Wyvern Clan (then under Hudson's leadership) and Prince Malcolm, with Hudson and Prince Malcolm in the lead roles, Goliath, Demona (at that point named "Angel", short for "Angel of the Night"), and the Coldtrio in supporting roles, and the Archmage (who is allied with Iago) as a villain (although presumably one whose true nature has not yet been revealed to the Prince). The trio are only children at this point, and would most likely have had a minor, possibly comic-relief, role.
The series would have, if it had been made and continued long enough, covered the story of the Wyvern Clan between the foundation of Castle Wyvern in 971 to its fall in 994, including an account of how Princess Elena and Prince Malcolm died. (Greg Weisman has mentioned having strong ideas for how those events took place, but has not revealed them as yet).
Greg wrote a piece of prose fiction entitled Once Upon A Time There Were Three Brothers..., which serves as a sort of lead-in to the series and can be read here.