The author of the "The Peri plus of the Erythraean Sea" was a

The author of "The Periplus of the Erythraean Sea" was a

Option A: Historian
The author of "The Periplus of the Erythraean Sea" was not primarily a historian. This ancient text is more of a geographical and maritime document.

Option B: Poet
The author was not a poet; the work is not a poem but a description of trade routes and coastal areas in the Indian Ocean region.

Option C: Sailor
This is the correct answer. The author of "The Periplus of the Erythraean Sea" was most likely a sailor or merchant who wrote about trade routes, ports, and navigation in the Indian Ocean during ancient times. The document provides valuable insights into maritime trade.

Option D: Musician
The author was not a musician, and the work is unrelated to music.

Therefore, the correct answer is Option C: Sailor.