"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:

http://www.greekmedicine.net/b_p/Four_Humors.html

http://kheper.net/topics/typology/four_humours.html