According to Harold Brooks-Baker, then-publishing director at Burke's Peerage:
“It is little known by the British people that the blood of Mohammed flows in the veins of the queen. However, all Muslim religious leaders are proud of this fact.”
How the genealogical lineage was made
Brooks-Baker explained how the blood relation between the British royal family and Prophet Muhammad came to be.
"The British royal family is descended from Mohammed through the Arab kings of Seville, who once ruled Spain. By marriage, their blood passed to the European kings of Portugal and Castille, and through them to England’s 15th century King Edward IV."
Abu al-Qasim Muhammad ibn Abbad, of the Umayyads Caliphate and descendant of Prophet Muhammed, was the first Muslim ruler of the Spanish city, Seville, till his death in 1042. He had formed the Abbadid dynasty which lasted from 1023 till 1091.
Al-Qasim's grandson, Muhammad Al-Mu'tamid, took over Cordoba, Spain, in 1071, and was after dethroned in 1091 by the Almoravids of Morocco.
After the fall of the dynasty, Al-Qasim's daughter, Zaida, married King Alfonso VI, Spanish king of Leon and Castile, later converting to Roman Catholicism.
Isabella of Castile, wife of Edmund of Langley - first Duke of York - gave birth to Richard of Conisburgh, Earl of Cambridge.
Plantagenet had fathered Edward IV, king of England, who ruled the kingdom from1547 until 1553.
And as they say, the rest is history...