Edward Frederick Mylius (4 July 1878 – 24 January 1947) was a Belgian-born journalist jailed in England in 1911 for criminal libel after publishing a report that King George V of the United Kingdom was a bigamist.

In January 1910, Edward Holton James wrote to Mylius to suggest an article based on an existing rumour[b] that George V had previously married and had children via that marriage.

[2] In the 19 November 1910 issue of The Liberator, Mylius alleged in an article entitled "Sanctified Bigamy" that in Malta in 1890,[c] George V had married "the daughter" of Admiral Sir Michael Culme-Seymour, and the marriage had produced three children.

The King, with the advice of Home Secretary Winston Churchill, issued proceedings against Mylius for criminal libel and said he was prepared to go into the witness box to disprove the allegations.

[2][5] George V recorded his feelings on the affair in his diary: His mother, Queen Alexandra, wrote to him: Serving his sentence at Wormwood Scrubs Prison,[2] Mylius was released after 10 months for good conduct.

There, beyond the reach of English libel law, he published another version of the claim, which appeared in a 1916 pamphlet, The Morganatic Marriage of George V, printed in Greenwich Village by Guido Bruno.

[2] The allegation was bolstered by finding a Hampshire Telegraph and Sussex Chronicle report of Mary Culme-Seymour dancing with the prince at a ball at Portsmouth Town Hall on 21 August 1891.

The king's biographer, Kenneth Rose, acknowledged in his 1983 book that Mary had had "a slip of memory" but judged it "utterly irrelevant to the accusation of bigamy".

[2] His appeal with the US State Department was denied, but he was successful in federal court, a judge ruling in February 1913 that libel was not a crime of moral turpitude.