"a Spartan in adversity"

Technically, a Spartan is a native of the city of Sparta, located at the south central part ofthe Greek island-peninsula of the Peloponnese, and more especially from the ancient Greek city-state that was a fabled rival of Athens. Because the Spartans were renowned soldiers and warriors, to call someone a “Spartan” implies he is a fierce and dedicated fighter.

Naturally, the figure has become a popular American sports mascot: Michigan State, San Jose State, Case Western Reserve, and the University of Tampa are among the college teams that go by the name Spartans, and Wikipedia lists nearly 100 high schools, day schools, and private academies whose teams compete under the title as well.

Over time, the term has also evolved to the lower-case “spartan,” which connotes highly disciplined, brave, and austere.