Polyeleos, mode III in English. Who is the author?

[Феодор]

https://www.youtube.com/watch?v=ijkgjMWD6P0

Does anyone know who the author of the original Greek melody is?

 

[neoklis]

https://www.youtube.com/watch?v=ijkgjMWD6P0

Does anyone know who the author of the original Greek melody is?

Grigorios protopsaltis.