Mustafa Gaibi (17th century) was a dervish-shaykh of Ottoman Bosnia, venerated as a saint in Sufi circles. After his death he was buried at Stara Gradiška in Slavonia, where his grave became a Muslim site of pilgrimage; in 1825 Emperor Francis I of Austria ordered a small türbe built over it, renovated in 1868. The türbe was relocated around 1954 across the Sava river to Bosanska Gradiška (Bosnia and Herzegovina), where it now stands and holds national-monument status. (Sources: Mustafa Gaibi, Wikipedia (Wikidata Q61890337); 'Under the Gaibi's Tree', RAI 2020 academic paper, nomadit.co.uk)