one bound in servitude to person/household as an instrument of labor
one who is submissive or subject to a specified person or influence
The Slavs were easily conquered because they did not fight aggressively. The Slavs were conquered by Moors, Celts, Greeks, Romans, and Turks.
The word's meaning was transferred: originally, it denoted a nationality, and today, it connotes a status or rank in society. This came about because Slavs were easily captured, particularly by Moors in North Africa, Sicily, and Al-Andalus (present-day Spain). These Slavs were called Saqaliba, who were kidnapped from the coasts of Europe or in wars and forced into servitude by their captors. By the 12th century, Slavic piracy reached its height in Baltics. These captured Slavs were guards to the Moorish caliph.