In medieval art, we often do not have an artist's name to search on. It may help to think of terms related to the critical tools and analysis methods of art history:
Media: granite sculpture, panel painting, manuscript, metalwork, ivory carving, stained glass
Historical Context, Place: France, Paris, Africa, Ethiopia
Historical Context, Time: 12th century, twelfth century, 900s
Social Context: church art, portraiture, patronage, gold trade, funerary art
Style/Culture: romanesque, gothic, international style, islamic art, mamluk
Iconography: virgin mary, king david, susanna and the elders, the nativity, saint theodore