The Tomb of Suleyman Shah (; ) is, according to Ottoman tradition, the grave (tomb, mausoleum) housing the relics of Suleyman Shah (c. 1178–1236), grandfather of Osman I (d. 1323/4), the founder of the Ottoman Empire. This legendary tomb has since 1236 had three locations, all in present-day Syria.
From 1236 until 1973, its first location was near castle Qal'at Ja'bar in present-day Raqqa Governorate, Syria.
Under the Treaty of Lausanne (1923), breaking up the Ottoman Empire into Turkey, Syria, and other states, the tomb site remains the property of Turkey.
In 1973, when the area around castle Qal'at Ja'bar was due to be flooded under Lake Assad, the tomb by agreement between Turkey and Syria was moved northward on the Euphrates River in Syria, from the Turkish border.
In early 2015, during the Syrian Civil War, Turkey unilaterally moved the tomb again to a new site in Syria, about from the Turkish border, west of Kobanî and just north of the Syrian village of Ashme, evacuating the approximately 40 Turkish soldiers guarding the tomb. The Turkish government has stated that the relocation is temporary, and that it does not constitute any change to the status of the tomb site.
Death of Suleyman Shah
Suleyman Shah (c. 1178–1236) was, according to some but not all Ottoman genealogies, the grandfather of Osman I (d. 1323/4), the founder of the Ottoman Empire. Suleyman Shah is believed to have drowned in the Euphrates river near castle Qal'at Ja'bar in present-day Raqqa Governorate, Syria, and was according to legend buried near that castle, in a tomb.
Legal status of tomb
Article 9 of the Treaty of Ankara, signed by France and Turkey in 1921, states that the tomb of Suleyman Shah (at its first location) "shall remain, with its appurtenances, the property of Turkey, who may appoint guardians for it and may hoist the Turkish flag there" Initially, an 11-man symbolic garrison of Turkish soldiers was guarding the tomb.
The Protocol of 2003 between the Republic of Turkey and the Syrian Arab Republic regarding the Tomb of Suleyman Shah (at its second location) gave Turkey transit rights to the Tomb through Syrian territory, in order to maintain and carry out repairs at the Tomb. Since 2014, the official position of Turkey appears to be that the land around the second location (1973 – February 2015) of the tomb is or was the sovereign territory of Turkey. Turkey required visitors to the site to carry passports. However, there is no evidence to date that other countries, including Syria, have publicly supported this position.
The Syrian position is that the first relocation relinquished any Turkish rights over the sovereignty of the site, and the latest relocation of the tomb in February 2015 (to its third location) is a breach of the Treaty of Ankara.
First relocation
In 1973, the area around castle Qal'at Ja'bar, with the location of the tomb, was due to be flooded when the Tabqa Dam would create Lake Assad.
The tomb by agreement between Turkey and Syria then was moved to a new location at some northward but also on the Euphrates riverside and also in Syria, northwest of the town of Sarrin, in Aleppo Governorate, and some from the Turkish border.
Until February 2015, Turkey maintained at this site a small military presence as an honor guard.
Events during the Syrian Civil War
On 5 August 2012, during the Syrian Civil War, the Turkish prime minister Recep Tayyip Erdoğan stated that "The tomb of Suleyman Shah [in Syria] and the land surrounding it is our territory. We cannot ignore any unfavorable act against that monument, as it would be an attack on our territory, as well as an attack on NATO land... Everyone knows his duty, and will continue to do what is necessary".
ISIL threats
On 20 March 2014, the Islamic State of Iraq and the Levant (ISIL) threatened to attack Turkey's territory tomb site unless the Turkish troops guarding it were withdrawn within three days. The Turkish government reacted by saying it would retaliate against any such attack, and did not withdraw its guards. However, the threatened attack did not take place. Due to (such) tensions, the garrison at the tomb was increased to 38 men, in 2014 or earlier.