Diplomatic

DIPLOMATIC

1. of or relating to diplomacy or diplomats

2. skilled in negotiating, especially between states or people

3. tactful in dealing with people

4. of or relating to diplomatics, i.e. the science of deciphering old official documents, as charters, and of determining their authenticity, age, or the like.

He’d studied diplomatics

And his mother told everyone so

Except she made him an ambassador

Where he was a scholar.