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Calixtus II

(Encyclopedia)Calixtus II, Callixtus II, or Callistus II, d. 1124, pope (1119–24), named Guy of Burgundy, successor of Gelasius II. The son of count William I of Burgundy, he was archbishop of Vienne during the ...

Boleslaus II

(Encyclopedia)Boleslaus II, c.1039–1081, duke (1058–76), and later king (1076–79) of Poland; son and successor of Casimir I. Throughout his reign he opposed the influence of the Holy Roman Empire. He asserted...

Boleslav II

(Encyclopedia)Boleslav II, d. 999, duke of Bohemia (967–99), son and successor of Boleslav I. Continuing his father's policies, he largely completed the Christianization of Bohemia. In 973 he agreed to the establ...

Beyazid II

(Encyclopedia)Beyazid II, 1447–1513, Ottoman sultan (1481–1512), son and successor of Muhammad II to the throne of the Ottoman Empire (Turkey). With the help of the corps of Janissaries he put down the revolt o...

Agesilaus II

(Encyclopedia)Agesilaus II əjĕˌsĭlāˈəs [key], c.444–360 b.c., king of Sparta. After the death of Agis I (398? b.c.), he was brought to power by Lysander, whom he promptly ignored. After the Peloponnesian W...

Ahmed II

(Encyclopedia)Ahmed II, 1642–95, Ottoman sultan (1691–95), brother and successor of Sulayman II to the throne of the Ottoman Empire (Turkey). Soon after his reign began, the Turkish defeat at Slankamen, Serbia ...

Urban II

(Encyclopedia)Urban II, c.1042–1099, pope (1088–99), a Frenchman named Odo (or Eudes) of Lagery; successor of Victor III. He studied at Reims and became a monk at Cluny. He went to Rome, as prior of Cluny, earl...

Mayer, Julius Robert von

(Encyclopedia)Mayer, Julius Robert von, 1814–78, German physician and physicist, studied medicine at Tübingen, Munich, and Paris. From a consideration of the generation of animal heat, he was led to determine th...

Dedekind, Julius Wilhelm Richard

(Encyclopedia)Dedekind, Julius Wilhelm Richard yo͞olˈyo͝os vĭlˈhĕlm rĭkhˈärt dāˈdəkĭnt [key], 1831–1916, German mathematician. Dedekind studied at Göttingen under the German mathematician Carl Gauss...

Clausius, Rudolf Julius Emanuel

(Encyclopedia)Clausius, Rudolf Julius Emanuel ro͞oˈdôlf yo͞oˈlyo͝os āmäˈno͞oĕl klouˈzēo͝os [key], 1822–88, German mathematical physicist. A pioneer in the science of thermodynamics, he introduced th...