Chronological Table 423
November: William de Montferrat ill in Brindisi and his crusade
delayed.
December: Thessalonica surrenders to the Greeks of Epirus.
1225 Otto de la Roche returns to Burgundy leaving the lordship of Athens
and Thebes to his nephew Guy.
William de Montferrat’s crusade peters out in Thessaly.
1227 18 March: death of Pope Honorius iii.
27 March: coronation of Pope Gregory ix.
April: Emperor Robert in Rome with plan to abandon Constantinople.
Late 1227/early 1228: death of Geoffrey I de Villehardouin.
1228 January: death of the Emperor Robert at Glarenza.
February: Maria de Courtenay becomes regent for her brother the
Emperor Baldwin ii.
1229 9 April: treaty of Perugia; John de Brienne agrees to become co-
emperor with the 12 year-old Baldwin ii who will become his
son-in-law.
1230 April: Epirote army defeated by the Bulgarians at Klokotnica, which
weakens their hold on Thessalonica and reduces their threat to
Constantinople.
Latins in Constantinople looking to Cumans for military support.
Death of Demetrios, titular king of Thessalonica at Amalfi. He
bequeaths his interests to the Emperor Frederick ii.
1231 Late July: John de Brienne arrives in Constantinople.
Geoffrey ii de Villehardouin sends his first subsidy of 22,000
hyperpera to Constantinople.
1232–34 Negotiations for the union of the Churches culminate in debates
between Latin friars and Greek clergy at Nicaea and Nymphaeum.
1234 Gregory ix sends mission to Nicaea to discuss Church union in return
for the cession of Constantinople.
1235 Nicene Greeks take Gallipoli from the Venetians.
July: Greek raids on Thebes increase in frequency.
1236 Winter: Geofrey ii de Villehardouin with a fleet of 120 ships relieves
Constantinople from Greek attack.
1237 March: death of John de Brienne in Constantinople.
Agreement with the Cumans signed.
1238 18 January: first papal levy on the Latin Church in Greece to aid the
Latin Empire.
Baldwin ii in western Europe seeking military aid.
September: the Latin Empire sells the relic of the Crown of Thorns to
Louis ix.