PamplonayoudaoicibaDictYouDict[Pamplona 词源字典]
city in Spain, Roman Pompeiopolis, named for Pompey, Roman emperor who founded it 68 B.C.E.[Pamplona etymology, Pamplona origin, 英语词源]
Rubicon (n.)youdaoicibaDictYouDict
in phrase to cross (or pass) the Rubicon "take a decisive step," 1620s, a reference to a small stream to the Adriatic on the coast of northern Italy which in ancient times formed part of the southern boundary of Cisalpine Gaul; crossed by Caesar Jan. 10, 49 B.C.E., when he left his province to attack Pompey. The name is from Latin rubicundus "ruddy," in reference to the color of the soil on its banks.