The Coburg Conspiracy will investigate whether Albert’s real father was his uncle Prince Leopold or a Jewish royal aide named Friedrich Blum.
Rumours of Albert’s illegitimacy have existed ever since Ernst I, Duke of Saxe-Coburg and Gotha divorced his mother Luise of Saxe-Gotha-Altenburg for adultery in 1826.
Having been exiled from court and forbidden from seeing Albert and his elder brother Ernst II, Luise married the Baron von Hanstein – who has also been caught up in the speculation about Albert.
Author Richard Sotnick learnt German to search through archives in Coburg in a bid to discover the truth.
Among the potential candidates is Prince Leopold, Ernst I’s brother, who had visited around nine months before Albert was born.
The controversial claim featured in a recent plotline of the popular ITV series Victoria, which will return for a special two-hour long episode on Christmas Day.
Mr Sotnick’s book suggests a more likely candidate might be Blum, a member of the household at Schloss Ehrenburg.
It has been claimed in an affidavit by ancestors of Blum, originally from Latvia, that he had an affair with the princess and a baby was born whose name had been Albrecht.
Mr Sotnick claims there are “marked physical similarities” between Albert and the descendants of the Blum.
The Coburg Conspiracy, by Richard Sotnick is published by Ephesu Publishing and now available in eBook.