Kebawah Duli Yang Maha Mulia Sultan Muhammad IV (Tengku Long Senik putera Long Kundur).

Semasa pemerintahan Sultan Mansor, Tengku Long Senik telah dilantik sebagai Raja Kelantan, pewaris pertama takhta kerajaan Kelantan.
Tahun 1900, Sultan Mansor mangkat tanpa meninggalkan pewaris.
Tengku Long Senik telah dilantik menjadi Raja Pemerintah dengan gelaran Raja Kelantan.
Pada 22 Jun 1911, telah ditabal dengan rasminya menjadi Sultan Muhammad IV.
Juga telah mendapat pengiktirafan Kerajaan Siam.
Banyak perubahan telah diperkenalkan yang telah membawa kemajuan yang pesat di negeri Kelantan.
Telah dikurniakan dengan bintang K.C.M.G oleh Raja England pada tahun 1913 yang disampaikan oleh Pesuruhjaya Tinggi British di Istana Balai Besar, Kota Bharu.
Seorang Raja yang cergas dan sentiasa berdamping dan menerima nasihat daripada para Menteri dan Ahli Mesyuarat Negeri.
Mangkat pada malam Khamis 23 Disember 1920 setelah memerintah negeri Kelantan selama 20 tahun.
Jenazah baginda telah di Makam DiRaja Langgar, Kota Bharu.

During the reign of Sultan Mansor, His Highness Tengku Long Senik was appointed Raja Kelantan, the first rightful heir to the throne of Kelantan.
In 1900, Sultan Mansor passed away and Tengku Long Senik was appointed Raja of Kelantan.
On 22 June 1911, His Highness Tengku Long Senik was officially crowned as the Sultan of Kelantan with the title Sultan Muhammad IV.
Was given recognition by the Emperor of Siam.
Many changes were brought about during the reign of His Highness, resulting in the rapid development of the State of Kelantan.
Awarded His Highness the K.C.M.G medal in 1913 at the Istana Balai Besar, Kota Besar by the British High Commissioner.
Being an energetic and true King, and always mingled closely with his subjects and was ever willing to accept advice from his ministers and members of the State Executive Committee.
After a 20-year reign. His Highness Sultan Muhammad IV died on Thursday night of December 23 1920.
His Highness was laid to rest at the Royal Mausoleum of Langgar, Kota Bharu.