Hellas, or Έλλας, is the Hellenic name for the region more commonly known as Greece, which is anglicized from the the name the Barbaroi Romaioi used, Graecia.
Historically, Hellas was a disunified region due to its mountainous region, creating diversity and
of course, fighting that made them manly enough so that Megas
Alexandros could use some of them alongside his Makedonian Greeks in smashing the PERSAI. Although the Diadochoi power wasn't in Mainland Hellas, Hellas there was still known for the FIRST ZOO in the world (even the term Zoo is derived from ζωον, meaning animals) as well as some of the largest ships in ancient history (Zheng He and his treasure ships would have to wait one and three fifths of a millenia), as well as
the invention of many war machines such as the lithoboloi and the katapeltai (katapeltai first indicated in Syrakousai, a Hellenic city in Trinakrie). Hellas' most important
contribution to the modern world is that it defended democracy by buttwhooping the Italians under Mussolini, and delaying the Nazis enough to get General Winter activated to freeze Nazi ass, even though the leader of Hellas was Fascist himself.
Detractors of Hellenes, largely the Skopioi, say Hellass (ironically revering the actual name rather than using the name defiled by the ROMAIOI) because they envy the Hellenic contributions of the world: The Skopioi didn't have a republic in the 19th century!