Engagement and wedding
In 1905, King Alfonso XIII of Spain made an official state visit to the United Kingdom. Ena's maternal uncle, King Edward VII, hosted a dinner in Buckingham Palace in honour of the Spanish monarch. Alfonso was seated between Queen Alexandra and Princess Helena, King Edward's sister. He noticed Ena and asked who the dinner guest with almost white hair was. Everybody knew that King Alfonso was looking for a suitable bride and one of the strongest candidates was Princess Patricia of Connaught, another niece of King Edward. As Princess Patricia seemed not to be impressed by the Spanish monarch, Alfonso indulged his interest in Ena, and so the courtship began. When Alfonso returned to Spain he frequently sent postcards to Ena and spoke of her approvingly. His mother, Queen Maria Christina, did not like her son's choice, in part because she considered the Battenbergs non-royal because of the obscure origin of Prince Henry's mother, and in part because she wanted her son to marry within her own family. Other obstacles to a marriage were religion (Alfonso was Roman Catholic, and Ena was Anglican); and the potential problem of haemophilia, the disease that Queen Victoria had transmitted to some of her descendants. Ena's brother, Leopold, was a haemophiliac, so there was a 50% probability that she would be a carrier, although the degree of risk was not yet known. Still, if Alfonso married her, their issue could be affected by the disease. Nonetheless, Alfonso was not dissuaded.
After a year of rumours about which princess Alfonso would marry, his mother finally acceded to her son's selection in January 1906 and wrote a letter to Ena's mother, telling her about the love Alfonso felt for her daughter and seeking unofficial contact with the king. Some days later at Windsor, King Edward congratulated his niece on her future engagement.
Princess Beatrice and her daughter arrived in Biarritz on 22 January and stayed at the Villa Mauriscot where some days later King Alfonso met them. At the Villa Mauriscot, Alfonso and his future bride conducted a chaperoned, three-day romance. Then, Alfonso took Ena and her mother to San Sebastián to meet Queen Maria Christina. On 3 February, the king left San Sebastian to go to Madrid and Ena and her mother went to Versailles where the Princess would be instructed in the Catholic faith: as the future Queen of Spain, she agreed to convert. The official reception of Ena into the Catholic faith took place on 5 March 1906 at Miramar Palace in San Sebastián.
The terms of the marriage were settled by two agreements, a public treaty and a private contractual arrangement. The treaty was executed between Spain and the United Kingdom in London on 7 May 1906 by their respective plenipotentiaries, the Spanish Ambassador to the Court of St James's, Don Luis Polo de Bernabé, and the British Foreign Secretary, Sir Edward Grey, Bt. Ratifications were exchanged on 23 May following. Among other conditions, the treaty stipulated:
BE it known unto all men by these Presents that whereas His Catholic Majesty Alfonso XIII, King of Spain, has judged it proper to announce his intention of contracting a marriage with Her Royal Highness Princess Victoria Eugénie Julia Ena, niece of His Majesty Edward VII, King of the United Kingdom of Great Britain and Ireland and of the British Dominions beyond the Seas, Emperor of India, and daughter of Her Royal Highness the Princess Beatrice Mary Victoria Feodore (Princess Henry of Battenberg)…
Article I. It is concluded and agreed that the marriage between His said Majesty King Alfonso XIII and Her said Royal Highness the Princess Victoria Eugénie Julia Ena shall be solemnized in person at Madrid as soon as the same may conveniently be done.
II. His said Majesty King Alfonso XIII engages to secure to Her said Royal Highness the Princess Victoria Eugénie Julia Ena from the date of her marriage with His Majesty, and for the whole period of the marriage, an annual grant of 450,000 pesetas. His said Majesty King Alfonso XIII also engages, if, by the will of Divine Providence, the said Princess Victoria Eugénie Julia Ena should become his widow, to secure to her, from the date of his death, an annual grant of 250,000 pesetas, unless and until she contracts a second marriage, both these grants having already been voted by the Cortes. The private settlements to be made on either side in regard to the said marriage will be agreed upon and expressed in a separate Contract, which shall, however, be deemed to form an integral part of the present Treaty…
III. The High Contracting Parties take note of the fact that Her Royal Highness the Princess Victoria Eugénie Julia Ena, according to the due tenor of the law of England, forfeits for ever all hereditary rights of succession to the Crown and Government of Great Britain…
The treaty's reference to the forfeiture of Ena's British succession rights reflected neither any British government censure of the alliance nor any renunciation made by her. Rather, it was an explicit recognition of the fact that by marrying (and becoming) a Roman Catholic, Ena lost any right to inherit the British crown as a consequence of Britain's Act of Settlement 1701. This exclusion was personal and limited: those among her descendants who do not become Roman Catholic remain in the line of succession to the British Throne.
Despite this treaty, concern about the reaction to the marriage and to Ena's conversion among Protestants was accommodated by the British government's decision that King Edward need not grant official consent to the marriage in his Privy Council, despite the fact that his niece was a British subject. Although the Royal Marriages Act 1772 requires that descendants of King George II obtain the British sovereign's prior permission to marry by Order in Council, an exception exists for descendants of royal daughters who marry "into foreign families". Although the naturalisation of Ena's father in the United Kingdom had been initiated in Parliament a week prior to his marriage to Princess Beatrice, the nuptials were completed before the naturalisation, thus the government was able to take the position that Ena was not bound by the Royal Marriages Act 1772, and therefore the British king had legal authority neither to authorise nor forbid her marriage.
The king did, however, issue a royal warrant which read:
"Our Will and Pleasure is and we do hereby declare and ordain that from and after the date of this Warrant our Most Dear Niece Princess Victoria Eugénie Julia Ena, only daughter of Our Most Dear Sister Beatrice Mary Victoria Feodore (Princess Henry of Battenberg) shall be styled entitled and called Her Royal Highness before her name and such Titles and Appellations which to her belong in all Deeds Records Instruments or Documents whatsoever wherein she may at any time hereafter be named or described. And We do hereby authorize and empower Our said Most Dear Niece henceforth at all times to assume and use and to be called and named by the Style, Title and Appellation of Her Royal Highness accordingly. Given at Our Court of Saint James's, the Third day of April 1906: in the Sixth Year of Our Reign. By His Majesty's Command. M Gladstone"
Notice of this warrant was gazetted in the London Gazette which read:
"Whitehall 3 April 1906. The KING has been graciously pleased to declare and ordain that His Majesty's niece, Her Highness Princess Victoria Eugenie Julia Ena, daughter of Her Royal Highness the Princess Beatrice Mary Victoria Feodore (Princess Henry of Battenberg), shall henceforth be styled and called 'Her Royal Highness'; And to command that the said Royal concession and declaration be registered in His Majesty's College of Arms."
Princess Ena married King Alfonso XIII at the Royal Monastery of San Jerónimo in Madrid on 31 May 1906. Present at the ceremony were her widowed mother and brothers, as well as her cousins, the Prince and Princess of Wales.
After the wedding ceremony, as the royal procession was heading back to the Royal Palace, an assassination attempt was made on the King and Queen when anarchist Mateu Morral threw a bomb from a balcony at the royal carriage; this incident would become known as the Morral affair. Ena's life was saved because, at the exact moment the bomb exploded, she turned her head in order to see St. Mary's Church, which Alfonso was showing her. She escaped injury, although her dress was spotted with the blood of a guard who was riding beside the carriage. A large statue in front of the Royal Monastery of San Jeronimo commemorates the victims of the bombing of 31 May 1906.
Later, Spanish composer Fernando Moraleda Bellver wrote a song about the attack: