Jaafar bin Haji Muhammad D.K., S.P.M.J., C.M.G. was the first and longest serving Dato' Menteri Besar of the independent kingdom of Johor, an office he held from 1886 until his death.

The Mahmoodiah Royal Mausoleum is a Royal Mausoleum of Johor located at Bukit Mahmoodiah in Jalan Mahmoodiah, Johor Bahru, Malaysia. The first Sultan of Johor buried here was Sultan Abu Bakar in 1895.