Tours developed a personal relationship between sovereign and colonial subjects, such as, viceregal officials, settlers, indigenous peoples and diasporic migrants. The expansion of European colonial empires provided a strengthened imperative for royal tours. Royal tours have also produced more official accounts by court chroniclers, often published in illustrated commemorative albums. Libraries, museums and private collections, and even landscapes, thus abound with evidence of royal tours. Tours by 'native' monarchs from Africa, Asia and Oceania presented, arguably, an even more complex scenario than those by Europeans. Partly because of risks and reservations, long-distance travel by European monarchs and other royals really emerged as a phenomenon only in the mid-1800s. The royal visitor was the central actor in a tour, but was surrounded by an entourage of other people and a store of paraphernalia that played essential roles.