Queen Elizabeth II
Queen Elizabeth II has won millions in one of her hobbies. Pictured: Queen Elizabeth II is seen at the Chichester Theatre while visiting West Sussex on Nov. 30, 2017 in Chichester, United Kingdom. Getty Images/Stuart C. Wilson

One of Queen Elizabeth II's hobbies has helped her earn her millions of dollars.

According to Reader's Digest, the queen is the wealthiest monarch in Europe. The majority of her net worth comes from her properties, including Balmoral Castle. Queen Elizabeth II also receives money from British taxpayers. But another hobby of hers also brings her a lot of money.

Queen Elizabeth II is a proud lover of horses. But she does not just settle on riding them occasionally or watching horse races passively. The monarch also puts her horses up in competition.

In fact, according to the data from My Racing, between 1988 to 2017, Queen Elizabeth II's horses have joined 1,815 raced and won 451 of those. Those victories gave Queen Elizabeth II over $9.4 million. In fact, the monarch is ranked 11th among the most successful owners of racing horses.

One of Queen Elizabeth II's best years in this business was in 2016 when her horses made $784,050. However, the majority of the earnings were spent on the training of the horses.

The monarch's enthusiasm for horses started when she had her first riding lesson. She was only 3 years old at the time. Ever since, Queen Elizabeth II has been a huge fan of horses.

When it comes to her business, the monarch is hands-on. Every July, the queen visits the Royal Stud at Sandringham in Norfolk where her horses are foaled. In addition, Queen Elizabeth Ii reads the Racing Post every morning.

"If the Queen wasn't the Queen, she would have made a wonderful trainer," her racing adviser John Warren told The Telegraph in 2008. "She has such an affinity with horses and is so perceptive."

In related news, the queen was very pleased with BBC's documentary about her coronation. In fact, she called the program makers and expressed her gratitude.

"She absolutely loved the documentary and was very pleased with how it turned out," a royal insider said. "She phoned the programme-makers to express her delight. She thought it was a great success."

In the documentary, the queen revealed that King George VI asked her to make a detailed review of his coronation. She also confessed t that her crowns were too heavy that it could break a neck.

"You can't lean down to read your speech. You have to bring [the speeches] up. Because if you did your neck would break and it would fall off," Queen Elizabeth II said. "Nothing like that is comfortable."