Ever since Donald Trump took office in 2017, conspiracy theories have swirled around him—but one of the strangest involves his son, Barron.

Some believe the Trump family might be time travelers. This theory gained momentum thanks to a 19th-century author, Ingersoll Lockwood, who wrote a book in 1893 called Baron Trump’s Marvelous Underground Journey. The story features a rich boy named Baron who lives in “Castle Trump” and is guided by a man named Don Fum.

The parallels to Barron Trump, Donald Trump, and even mentions of Russia have caught the attention of curious minds online. Lockwood’s books also talk about hidden knowledge and underground adventures—reminding some of Trump’s famous vow to “drain the swamp.”

Another of Lockwood’s works, The Last President, tells of a political outsider from New York who becomes president and chooses a man named Pence as his advisor—similarities that some say are more than coincidence.

While many dismiss it all as eerie but harmless fiction, others wonder: is it just coincidence… or something more?