His mother was Gülçiçek Hatun who was of ethnic Greek descent.

Wives and concubines
Bayezid had five consorts
Sultan Hatun (m. 1381), daughter of Prince Süleyman Şah Çelebi of the Germiyanids and Mutahhare Abide Hatun;
Devlet Hatun, mother of Mehmed I;
Despina Hatun (m. 1389), daughter of Prince Lazar of Serbia and Princess Miliza;
Hafsa Hatun (m. 1390), daughter of Prince Fahreddin Isa Bey of the Aydinids;
Maria Hatun (m. 1394), daughter of Louis Fadrique, Count of Salona and Helena Asanina Kantakouzene.

Sons
Şehzade Ertuğrul Çelebi; (1378 – 1400)
Şehzade Süleyman Çelebi (1377 – 1411), sultan of Rumelia, claimant to the Ottoman throne (reign 1402-1411)
Şehzade İsa Çelebi (1380 – 1406), governor of Anatolia, claimant to the Ottoman throne (reign 1403-1406)
Şehzade Mehmed Çelebi (1382 – 1421), governor of Anatolia, and later sultan Mehmed I (reign 1413–1421), with Devlet Hatun
Şehzade Musa Çelebi (1388 – 1413), sultan of Rumelia (1410–1413), claimant to the Ottoman throne (1406-1413)
Şehzade Mustafa Çelebi (1393 – 1422), sultan of Rumelia, claimant to the Ottoman throne (reign 1419-1422)
Şehzade Yusuf Çelebi, converted to Christianity, changed his name to Demetrios
Şehzade Kasım Çelebi, sent as a hostage to Constantinople together with his sister, Fatma Hatun;
Daughters
Hundi Hatun, married to Damat Seyyid Şemseddin Mehmed Buhari, Emir Sultan;
Erhondu Hatun, married to Damat Yakup Bey son of Pars Bey;
Fatma Hatun, married to a Sanjak Bey;
Oruz Hatun, who had a daughter named Ayşe Hatun;
A daughter, married to Abu Bakar Mirza, son of Jalal ud-din Miran Shah son of Timur;
His mother was Gülçiçek Hatun who was of ethnic Greek descent.
Wives and concubines
Bayezid had five consorts
Sultan Hatun (m. 1381), daughter of Prince Süleyman Şah Çelebi of the Germiyanids and Mutahhare Abide Hatun;
Devlet Hatun, mother of Mehmed I;
Despina Hatun (m. 1389), daughter of Prince Lazar of Serbia and Princess Miliza;
Hafsa Hatun (m. 1390), daughter of Prince Fahreddin Isa Bey of the Aydinids;
Maria Hatun (m. 1394), daughter of Louis Fadrique, Count of Salona and Helena Asanina Kantakouzene.
Sons
Şehzade Ertuğrul Çelebi; (1378 – 1400)
Şehzade Süleyman Çelebi (1377 – 1411), sultan of Rumelia, claimant to the Ottoman throne (reign 1402-1411)
Şehzade İsa Çelebi (1380 – 1406), governor of Anatolia, claimant to the Ottoman throne (reign 1403-1406)
Şehzade Mehmed Çelebi (1382 – 1421), governor of Anatolia, and later sultan Mehmed I (reign 1413–1421), with Devlet Hatun
Şehzade Musa Çelebi (1388 – 1413), sultan of Rumelia (1410–1413), claimant to the Ottoman throne (1406-1413)
Şehzade Mustafa Çelebi (1393 – 1422), sultan of Rumelia, claimant to the Ottoman throne (reign 1419-1422)
Şehzade Yusuf Çelebi, converted to Christianity, changed his name to Demetrios
Şehzade Kasım Çelebi, sent as a hostage to Constantinople together with his sister, Fatma Hatun;
Daughters
Hundi Hatun, married to Damat Seyyid Şemseddin Mehmed Buhari, Emir Sultan;
Erhondu Hatun, married to Damat Yakup Bey son of Pars Bey;
Fatma Hatun, married to a Sanjak Bey;
Oruz Hatun, who had a daughter named Ayşe Hatun;
A daughter, married to Abu Bakar Mirza, son of Jalal ud-din Miran Shah son of Timur;
Bayezid I