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Roman de la Rose, Le

(Encyclopedia)Roman de la Rose, Le lə rōmäNˈ də lä rōz [key], French poem of 22,000 lines in eight-syllable couplets. It is in two parts. The first (4,058 lines) was written (c.1237) by Guillaume de Lorris a...

Otto II, Holy Roman emperor

(Encyclopedia)Otto II, 955–83, Holy Roman emperor (973–83) and German king (961–83), son and successor of Otto I. He was crowned joint emperor in 967. Shortly after his father died Otto faced a rebellion by h...

Otto III, Holy Roman emperor

(Encyclopedia)Otto III, 980–1002, Holy Roman emperor (996–1002) and German king (983–1002), son of Holy Roman Emperor Otto II and the Byzantine princess Theophano. On Otto's accession Henry the Wrangler, the ...

Otto IV, Holy Roman emperor

(Encyclopedia)Otto IV, 1175?–1218, Holy Roman emperor (1209–15) and German king, son of Henry the Lion, duke of Saxony. He was brought up at the court of his uncle King Richard I of England, who secured his ele...

Otto I, Holy Roman emperor

(Encyclopedia)Otto I or Otto the Great, 912–73, Holy Roman emperor (962–73) and German king (936–73), son and successor of Henry I of Germany. He is often regarded as the founder of the Holy Roman Empire. Bol...

peri

(Encyclopedia)peri pērˈē [key], in Persian mythology, supernatural being. Peris were said to be fallen angels who were denied paradise until they did penance. Originally agents of evil, in later mythology they w...

Roche limit

(Encyclopedia)Roche limit, the closest distance that a celestial body held together only by its own gravity can come to a planet without being pulled apart by the planet's tidal (gravitational) force. This distance...

Hough, George Washington

(Encyclopedia)Hough, George Washington hŭf [key], 1836–1909, American astronomer, b. Montgomery co., N.Y., grad. Union College, 1856. He discovered 627 double stars and made systematic studies of the surface of ...

Thetis

(Encyclopedia)Thetis thēˈtĭs [key], in Greek mythology, a nereid, mother of Achilles. She was loved by both Zeus and Poseidon, but because of a prophecy that her son would be greater than his father, the gods ga...

Perrine, Charles Dillon

(Encyclopedia)Perrine, Charles Dillon pərīnˈ [key], 1867–1951, American astronomer, b. Steubenville, Ohio. He was on the staff of Lick Observatory (1893–1909) and was (1909–36) director of the Argentine Na...