advance-guard takes Bayt Nuba. He is warned by his nobles to take no further risks – due to winter conditions, and for being cut off if he presses on. Amongst those keenest on continuing are the French Crusaders under Hugh III. On December 25, Richard is now just 12 miles from Jerusalem. Europe April 15 – Henry VI, son of the late Emperor Frederick I (Barbarossa), is crowned as Emperor of the Holy Roman Empire, together with his wife Constance by Pope Celestine III, on Easter Monday at Rome. Henry marches south and begins a campaign in Apulia. He besieges Naples, but encounters the resistance of Sicilian forces under Margaritus of Brindisi, who come to support the city's defense. Tusculum is destroyed by the rebel army of the Commune of Rome, on April 17. August – Margaritus of Brindisi defeats the Pisan fleet during the siege of Naples, and nearly destroys the late-arriving Genoese contingent. He keeps the harbour approaches open for supplies and reinforcements. Prince Yury Bogolyubsky leads a rebellion of disaffected Georgian nobleman against his ex-wife, Queen Tamara (the Great), but her forces win a two pitched battle at Tmogvi and Erusheti. Yury is captured, and Tamara allows him to withdraw to Constantinople. Henry VI is forced to raise the siege of Naples, due to an epidemic, and returns to Germany. Upon Henry's retreat, the Lombard cities that have surrendered to the Germans resubmit to Tancred of Lecce, king or usurper of Sicily. The populace of Salerno turn against Empress Constance during her visit to the city, and Margaritus of Brindisi delivers her to Tancred at Messina. Later, Constance is imprisoned at Castel dell'Ovo at Naples. The counties of Flanders and Hainaut (modern Belgium) are united under Count Baldwin VIII. Flanders, a feudal fiefdom of France, becomes an important, wealthy independent state of Western Europe. Siege of Silves – Almohad forces under Caliph Abu Yusuf Yaqub al-Mansur reconquer Silves in Portugal. In the same campaign, the Almohads take also Alcácer do Sal, while Palmela and Almada are sacked. Berthold V, duke of Zähringen, founds the city of Bern (modern Switzerland). King Canute VI leads a Danish Crusade to Finland. England Spring – William de Longchamp, Chief Justiciar and regent, besieges Lincoln Castle accusing the castellan Gerard de Canville of corruption. In response, Prince John captures Nottingham and Tickhill castles from William. News of the dispute reaches Richard I,