Diodore of Tarsus d. 390AD

Though not a Church Father, he was nonetheless an orthodox defender of the Council of Nicaea.

See
https://en.wikipedia.org/wiki/Diodorus_of_Tarsus


Here is what he said about the globe earth

"Now he does well also to confute indirectly those who claim heaven is spherical and circular, a sphere and a circle having no beginnings and zenith, being self contained and revolving around a center."

Here: https://books.google.ie/books?id=IgQzPdBp_qUC&dq=diodore+of+tarsus&printsec=frontcover&source=web&ots=Mi5R4nV7DW&sig=1TPkze2_3M1KT2WluzdZ3Oe8WOA&redir_esc=y#v=onepage&q=globe&f=false

page 61 of the book