Explanation:

- Patrician: In ancient Rome, a patrician was a member of the aristocratic families who originally held power and were considered the ruling class. They were typically landowners and had political influence.

- Option 1, Land owner: Correct! Patricians were often landowners and held significant wealth and influence in society.

- Option 2, Landless labourer: Incorrect. Patricians were not laborers; they were the elite class.

- Option 3, Slave: Incorrect. Patricians were not slaves; they were the ruling class.

- Option 4, Slave master: Patricians may have owned slaves, but this term encompasses a broader role than just owning slaves. They were more than just ‘slave masters.’