1379—John and Manuel agree to increase their tribute of gold and soldiers, and to surrender Philadelphia, the last Byzantine possession in Asia, for Ottoman aid in ousting Andronicus IV from Constantinople.
1384—Osmanlis aid Thomas in besieging Janina.
1385—First Ottoman invasion of Albania.
Battle of Savra destroys Balsa’s power.
Osmanlis occupy Sofia.
1386—Osmanlis capture Croia and Scutari, but return these fortresses to prince of Zenta.
The fall of Nish makes Lazar of Serbia Ottoman vassal.
1387—Genoa concludes formal treaty with Murad.
Murad, with army containing Greek, Serbian and Bulgarian contingents, defeats Alaeddin of Karamania at Konia, but has to withdraw without tangible results.
1388—Venice concludes commercial treaty with Murad.