Where does “робя” come from?

робя (Old East Slavic) comes from Old East Slavic робъ, from Proto-Slavic orbъ, from Proto-Indo-European h₃órbʰos, from Proto-Indo-European h₃erbʰ- — to change allegiance, status, ownership;...

Ancestry of “робя”, step by step

StepLanguageWordMeaning
1Old East Slavicробъserf; slave
2Proto-Slavicorbъservant, slave
3Proto-Indo-Europeanh₃órbʰosorphan; servant, slave, worker
4Proto-Indo-Europeanh₃erbʰ-to change allegiance, status, ownership;...
Every word from Proto-Indo-European h₃erbʰ- →Every word from Proto-Indo-European h₃órbʰos →Every word from Proto-Slavic orbъ →