If you possess any of these artifacts, your movement is greatly increased. If you give a land movement artifact to a Barbarian, his movement is increased more than the others because of his movement bonus; the same goes for the Sorceress with water movement artifacts.
Nomad Boots of Mobility: extra movement on land
Traveler's Boots of Mobility: extra movement on land
True Compass of Mobility: extra movement on land and water
Sailor's Astrolabe of Mobility: extra movement on water