In the Early Middle Ages (the 5th century to the 10th century), the pronoun vos was used to address the most exalted figures, emperors and popes, who would use the pronoun tu to address a subject. This use was progressively extended to other states and societies, and down the social hierarchy as a mark of respect to individuals of higher rank, religious authority, greater wealth, or seniority within a family. The development was slow and erratic, but a consistent pattern of use is estimated to have been reached in different European societies by the period 1100 to 1500.