![]() ![]() Isaac tried to protect himself by concluding a treaty with Saladin, the sultan of Egypt, but he was soon forced to assist Frederick. In 1189 the Byzantine ruler was confronted with the Third Crusade, which, led by the Holy Roman emperor Frederick I Barbarossa, was passing through Byzantine territory. Find out who really invented movable type, who Winston Churchill called "Mum," and when the first sonic boom was heard. Get hooked on history as this quiz sorts out the past. In 1187 he was forced to recognize the second Bulgarian empire. Isaac II failed to crush the revolt of the Bulgarians and Walachians that broke out toward the end of that year, even though he led expeditions against them in 1186–87. Isaac was unsuccessful, however, in recovering Cyprus from the rebel Isaac Comnenus, who set himself up as an independent ruler of that island in 1185. Isaac’s reign was inaugurated by the decisive victory of his general Alexius Branas over the Normans who, after invading the empire and sacking Thessalonica (1185), were then driven off Greek soil (except for the islands of Cephalonia and Zacynthus ). ![]() In September 1185 Isaac was unexpectedly proclaimed emperor by the Constantinople mob that had murdered his cousin, the emperor Andronicus I Comnenus. 1135 ce-died February 1204), Byzantine emperor, who, although incapable of stemming administrative abuses, partly succeeded, by his defeat of the Serbians in 1190, in retrieving imperial fortunes in the Balkans. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find. ![]() Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives. ![]()
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