"Young Lord Douglas, most powerful of all the Scottish barons, was headstrong and impetuous, and like most Norman lords, choleric when he fancied himself crossed."
Lord of Samarcand
chol·er·ic
(kŏl′ə-rĭk, kə-lĕr′ĭk)
adj.
1.
a. Extremely irritable or easily angered; irascible: a choleric disposition.
b. Archaic Having choler as the dominant humor in terms of medieval physiology.
2. Showing or expressing anger: choleric remarks.
3. Obs.
a. bilious.
b. causing biliousness.
[1300–50; Middle English < Medieval Latin colericus bilious, Latin cholericus < Greek cholerikós. See cholera, -ic]
chol′er·i·cal·ly, chol′er·ic·ly adv.
For more information on the Four Humors: