God Promised King David to establish his throne?

and that through all generations his sons shall be known. Then He sent the Saviour and King of Kings to earth in the form of Yeshua or Jesus if you prefer. Rastafarians believe that the emperor Haile Selassie I was a later manifestation of Jesus Christ from the same lineage as him, that of King David. Are there any other popular claims of a similar nature? Anyone else claiming to be from the Royal House of David today?