Even if he went on a Crusade he wouldn't have been in lion country
Lions are common in all cultures but as to the quote above.

Jesus's 2 most common nicknames in prophecy and in the "bew testament" would be Lamb of God and Lion of Judah
Judah was one of the 12 tribes and as Lion of Judah represents power and kingship

Also danger is often listen in the Bible as "like a lion" in that it creeps up on you but is very dealy. Also Satan is likened unto a roaring lion seeking to destroy. So being in the crusades you probably heard a lot of daily preaching and lion is not an uncommon term.

Still lions in symbol are probably still common before the crusades. Most cultures concider the lion the bets hunter or strongest animal. Cats in general are pound for pound better killers than most any other animal and outside of a tiger a lion is about the biggest cat.
If you have kids I'm sure they love the "king of the jungle" songs from lion king and jungle book movies.

As far as lions existing in scotland......only in name comparison. To the best that I know of the species never lived there. I never read any history book of lions in scotland