The Habsburg family has chosen the scion of a storied Canadian dynasty as trustee for its fabled collection of jewels, recently revealed to be stashed in Quebec after being presumed missing for a century. Andrew Molson, a board member of the Molson Coors brewery and chairman of Avenir Global, a Montreal-based network of global communications firms, will be responsible for stewarding the 137-carat Florentine Diamond and an emerald watch worn by Marie Antoinette, among other treasures. The jewellery came to Canada in 1940 when Zita of Bourbon-Parma, the last Empress of Austria and Queen of Hungary, fled the Nazis and...