Bismillah Rahman Raheem. Sultan is an Arabic title for a person with high authority. In Islam, there are two kinds of Sultans:
1) Sultans of worldly affairs those who use that title to mean their highest position in an Islamic Caliphate for Example the Ottoman empire of Turkish.
2) Sultans of Spiritual affairs those are sent as prophet from Allah Subhanahu Wataala,or those who are embedded with knowledge as friends of Allah Subhanahu Wataala. Revelation to prophest or inspiration to Awliyaa llah ( Friends of Allah) is called Sultan from Allah Subhanahu Wataala brought by either Sayidina Jibrael aleih salaam to chosen one by inspiration to heart. So it depends either the message qualifies the chosen one to be prophet and messenger of Allah Subhanahu Wataala or to be secret Friend of Allah Subhanahu Wataala,that may be disclosed to few or many according to Allah’ will.
both prophets and awliyaae llah started from same Authority but bestowed upon chosen ones differently. And when Prophet hood ( Nubuwat) was ended, the Wilaayat continued to day of Judgement. Wilaayat became more important especially than before because no any prophet is going to come to guide the people, So teachings of Awliyaae-llah became the only guidance with inspiration from Allah Subhanahu Wataala that guides humanity according to Holy Quran and Hadith of ahlu Sunnah wal-Jamah.
The South of Authority for Sultans is called Suuh, the name for the entire entire Universe and entire sovereignty of Allah Subhanahu Wataala in the heavena and earth. Therefore every Waliyu-llah who reaches at the level of Qutub is Called Sultan Suuh. for example Great Wali of Allah Sayed Abdul Qadir Jailan of Qadri Tariqa, He is Sultan Suuh, Great Wali of Allah Sayed Abul Hassan Shadhili of Shadhili Tariqa is Sultan Suuh, and all others as you know them.
So currently His Highness Sultan Sheikh Yasin Muhammad Yaqeenullah Allamal Yaqeen Muhammad Al-Shuaib is the Sultan Suuh, he is head of Sultanate of Katuumu who is blessed with coming of Sayidina Jibrael aleih Salam (peace be upon Him) to him since 1999 and started teaching him until Ramadan 2019 when he publicly announced to the Ummah that He is the long awaited Imam Mahad Sadiqul Amin by the will and mighty of Allah Subhanahu Wataala who is sending Sayidina Jibrael aleih salaam to Him to save the Ummah to keep His promise, indeed Allah do not break His promise.
Biography of Sultan Suuh
His name is Sultan Suuh, Qutubul Aqtaab Al-ghauthiyat, Sultan Sheikh Yasin Muhammad Yaqeenu-llah Allamal Yaqeen Muhammad, Al-Shuaib , Khadimul Arshil Adhim, Khalifatu-llah, Imam Mahad Sadiqul Amin, Imam Alwarithin, Sayed Al-Abraar, Khalifatul Islam, Jabalul Haqq, Shafie, Shadhili Al-Yashurtiy, Grand Mufti South Africa , He is the elder son of His Highness Sultan Suuh Sheikh Muhammad Ibn Sheikh Shuaib Ibn Is-haq Shadhili Al-Yashurtiy the heir of His Highness Sultan Suuh Sheikh Shuaib Ibn Is-haq Shadhili Al-Yashurtiy the founder of Sultanate of Katuumu after he separated from Buganda Kingdom. His Mother’s Name is Her Highness Sultana Hafswa Bint Ibrahim Shadhili Al-Yashurtiy.