persona gra·ta 
(pər-sōnə grätə, grătə)
(pər-sōnə grätə, grătə)n. pl. per·so·nae gra·tae (-nē; -tē)
A person who is acceptable or welcome, especially to a foreign government: The successful treaty made the ambassador a persona grata. The foreign ministry deemed the envoy to be persona grata.
[Late Latin persōna grāta : Latin persōna, person + Latin grāta, feminine of grātus, acceptable.]