The memoir, which was launched on March 23 at the Sheraton Hotel in Kampala, is currently number one under the 'Best Sellers in East Africa History' category.
The Nnaabagereka of Buganda Queen Sylvia Nagginda Luswata, the eponymously-named book, won the bestseller badge on Amazon.
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The book, which is retailing for $20.42 (about Shs77,000), also got a five-star rating.
The book started drawing interest after people started sharing interesting excerpts from it on social media. It's loaded with information that many people didn't know about.
A few days after launch, local retailers announced that it had sold out.
The memoir, which revealed some captivating details about the relationship between Nagginda and her husband, Kabaka Ronald Muwenda Mutebi, was written by Dr. Dennis Sempebwa.
Dr. Sempebwa, who is a professional author, is the founder of Eagle’s Wings Press, which published the book.
He currently lives in Texas, U.S.A.
One of the biggest revelations in the book was that Sylvia Nagginda has twins.
They are Jade Nakato and Jasmine Babirye and they were born on December 6, 2010.
While some thought the Kabaka was the biological father, the kingdom said he isn't.
In a statement, the kingdom said Daudi Chwa was the last king to sire twins. They are Kalemera and Kiggala and they were born in 1925.
Buganda culture stipulates that the Kabaka and his wives are free to raise children in the palace despite their origin as long as the Kabaka agrees to it, read the statement.
The statement also said that these children can call the Kabaka their father and they can also call his wives their mothers.