WASHINGTON — Reince Priebus was ousted Friday as President Trump’s chief of staff, after weeks of speculation about his status within the White House. His departure culminated in a very public display of a rivalry with the new White House communications director, Anthony Scaramucci.

The relationship between Mr. Priebus and Mr. Trump — one a creature of the Republican establishment who rarely speaks in definitives, the other a Manhattan outsider famous for his brash language — goes back much farther than is widely known.

Here is a look at some of the milestones in their shared past to help explain their current status.