The Lions, remember, disbanded at the end of 2007 and reformed last year for a tour of New Zealand. Half of these players have played for Great Britain (not England) in at least one Test match. Once you have made your guesses, check out the answers on the final page.
9. BJ Mather
Mathers saw domestic success with Wigan and was a member of the Challenge Cup-winning side of 1994 as well as a member of the side that defeated the Brisbane Broncos in the 1994 World Club Challenge at Brisbane's ANZ Stadium.
10. Ben Westwood
Westwood is Warrington's talisman and has been the top tackler at the club for the last two seasons. The 38-year-old, a three-time Challenge Cup winner, has featured nearly 450 times for Wolves.
11. Answers
This was a tricky one. Let us know your scores! Did you manage to guess all 20 correctly?