a slave
Whats serf
The homonym for "serf" is "surf."
Your question is not entirely correct in its premise; a serf is not a slave and does not have an owner. A serf is a subject of a land owner whom the serf would address as lord.
In a feudal system, a serf would remain a serf no matter how hard they were to work.
Saint Serf died in 583.
Saint Serf was born in 500.
Riddle answer: a serf board.
The noble executed the serf.
The plural of the word "serf" is "serfs."
Peasant/serf
I doubt that they thought about the serf one way or the other. The serf was to do the work and didn't require much thought from his master.
It is probably safe to say that anyone who was a serf was also poor.