About 50 people filled the Aratoi foyer for the official launch of the book on Sunday afternoon.
Mr Allom told the crowd he was pleased to get to this point: "It's been five years of serious work."
He said he and wife Kate were going through old letters and documents when the book idea was born.
It details how Albert leased 10,000 acres of land from Maori at Tauanui, now known as Pirinoa, for 10 a year, and some of the dealings with Ngairo, the rangatira or Maori chief.
"It's a fascinating window of Wairarapa," said Mr Allom.
Using the National Library's online archive of newspapers, Papers Past, had helped him enormously to paint a picture of who Albert was in the eyes of the public.
"It opened up a new angle," Mr Allom said.
The book was not just about Albert and Wairarapa, but also New Zealand at that time.
Mrs Allom had suggested the title, Dear Tyrant, which was what Albert's wife called him.
Mr Allom said many people asked him why this was but he wouldn't reveal the reason.
"When you read it, you will [get] the significance."
Mr Allom's son designed the book cover and his grandson Caleb, Albert's great-great- great-grandson, read an excerpt from Dear Tyrant at the launch.
He reminded people not to throw away historical momentos, and to value their heritage as tangata whenua did.
"I urge you to value and care for your history," he said.
The book, published by Fraser Books, is available to buy at the Wairarapa Archive office, Hedleys and Paperplus.
