Atlas of Battles

siege, major, medieval

Siege of Bursa

Siege of Bursa was a siege conducted in 1317 at Bursa, in what is now Turkey; it lasted about 9 years. It was part of the Byzantine–Ottoman wars, which ran from 1265 to 1479. Recorded strength: Unknown against Unknown.

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Osman Gazi seizes Bursa, 1326
Osman Gazi seizes Bursa, 1326. Rycaut, Paul, Public domain, via Wikimedia Commons.
Fought1317lasted about 9 years
WhereBursa, Turkey40.183N, 29.067E
OutcomeOttoman victory; The Ottomans capture Bursa and establish their first capital.; Bursa becomes the first official capital of the Ottoman Beylik.
BelligerentsOttoman BeylikagainstByzantine Empire
Part ofByzantine–Ottoman wars1265 to 1479

Where it sits in the Byzantine–Ottoman wars

Siege of Laodicea, 1119Battle of Mount Armenia, 1282Siege of Kulaca Hisar, 1285Battle of Domaniç, 1287Siege of Karacahisar, 1288Siege of İnegöl, 1299Battle of Bapheus, 1302Siege of Bursa, 1317Siege of Mudanya, 1321Siege of Nicaea, 1328Battle of Pelekanon, 1329Siege of Nicomedia, 1333Fall of Gallipoli, 1354Reconquest of Gallipoli, 1366Fall of Philadelphia, 1378Siege of Thessalonica, 1383Fall of Constantinople, 1453Siege of Trebizond in 1461, 146011191460Siege of Bursa, 1317
18 placed engagements of the Byzantine–Ottoman wars in time order; taller ticks are more widely documented. Each tick is a link.

Record

Date1317 (year precision)
to 6 April 1326
PlaceBursa, Turkey
40.183N, 29.067E
KindSiege, medieval
StrengthUnknownUnknown
Commanders
  • Osman I
  • Orhan
  • Köse Mihal
Siege of BursaSiege of BursaBattle of Mount OlympusBattle of CivetotBattle of the RhyndacusBattle of NicaeaSiege of NicaeaBattle of Mount OlympusBattle of CivetotBattle of NicaeaEskişehirAdapazarıİzmitBalıkesirTekirdağKütahyaIstanbul100 km40.183N, 29.067E
The recorded site, with the nearest other engagements in the atlas. Present-day coastlines, rivers and borders; towns from Natural Earth.

The ground today

Relief of the ground around the site of Siege of Bursa
Relief within about 10.0 km of the site, contours every 100 m. Copernicus DEM GLO-30, ESA.
Satellite view of the site of Siege of Bursa today
The same ground from Sentinel-2 on 2025-04-16. Contains modified Copernicus Sentinel data 2025.

The recorded site stands at about 234 m; within 10.0 km the ground runs from 87 to 1,632 m, 1,545 m of relief, mountainous country and today it is 57% built-up, 40% tree cover, 2% grassland.

built-up: 57%tree cover: 40%grassland: 2%built-up 57%tree cover 40%grassland 2%
west to east, 10.0 km201 to 674 mnorth to south, 10.0 km90 to 1,043 m
Elevation from the Copernicus DEM GLO-30 (ESA, Airbus); land cover from ESA WorldCover 2021 (CC BY 4.0), within about 5 km of the recorded site. Computed, not recorded.

Nearest engagements

In the same war

Elsewhere in 1317

Siege of Bursa is one of 566 engagements of the 14th century in the atlas and one of 622 in present-day Turkey.

Sources

Identity, coordinates, dates and the war from Wikidata Q1099263, released under CC0. Result, belligerents, commanders, strength and casualties from the infobox of the English Wikipedia article Siege of Bursa, revision 1384520747, read 2026-11-14, licensed CC BY-SA 4.0; the article's text is not reproduced here. Present-day country and state from Natural Earth. Dates before 1582 follow the Julian calendar as recorded.