Ludovox http://ludovox.fr/jeu-de-societe/les-colons-de-catane-villes-et-chevaliers-408/
Français - Un jeu de Klaus Teuber.
Boardgamegeek https://boardgamegeek.com/boardgameexpansion/926/catan-cities-knights
Anglais - Adds several new aspects to Settlers of Catan but the two major ones are creating knights to protect the land from invading barbarians and building city improvements that confer benefits upon that city's owner. Adds tactical complexity to the game and game length.