CEVAP:

Major difference between modern ambassadors and resident ambassadors of the Renaissance was that usually the resident ambassadors of Renaissance were sent to
a country for a lifetime, whereas modern diplomats are rather appointed for a limited time and could be appointed several times to different countries. This lifetime appointment of the resident ambassadors in Renaissance also caused certain problems such as losing the contact with the home country after quite some time in the host country. The resident ambassadors sometimes internalized the country of appointment after a significant time of stay, and this caused weakening of the ties with the home country in some cases.