May 7. On this date in 1973, the Universal House of Justice addressed a letter "to the Bahá’ís of the World" publicly announcing the conversion of Malietoa Tanumafili II to the Bahá’í Faith, becoming to the first head of state and reigning constitutional monarch to do so.

May 7. On this date in 1973, the Universal House of Justice addressed a letter "to the Bahá’ís of the World" publicly announcing the conversion of Malietoa Tanumafili II to the Bahá’í Faith, becoming to the first head of state and reigning constitutional monarch to do so.

The Universal House of Justice
7 May 1973
To the Bahá’ís of the World
Dear Bahá’í Friends,
It is now possible to share with you all the news of an event which crowns the victories with which Bahá’u’lláh has blessed His followers during the Nine Year Plan, an event of which the true significance will be fully understood only in the course of centuries to come: a reigning monarch has accepted the Message of Bahá’u’lláh.
Among those to whom The Proclamation of Bahá’u’lláh was presented in 1967 was His Highness Malietoa Tanumafili II, the Head of State of the independent nation of Western Samoa in the heart of the Pacific Ocean. His Highness, who had already heard of the Faith, showed immediately that the sacred Words had touched his heart, and the Universal House of Justice thereupon asked the Hand of the Cause Dr. Ugo Giachery, who had presented the book to him, to return to Western Samoa for further audiences with His Highness. Following this visit the Malietoa conveyed his acceptance of the Faith of Bahá’u’lláh to the Universal House of Justice and became the first reigning sovereign to enter beneath the shade of this Cause.
His Highness decided, with the full agreement of the Universal House of Justice, that it was not propitious to make his declaration public at that time. He has been visited from time to time by Hands of the Cause and other believers, and continual touch with His Highness has been maintained by the House of Justice through Mr. Suhayl ‘Alá’í, a member of the Continental Board of Counselors for Australasia. Gradually the Malietoa has let it be known to those around him that he has accepted Bahá’u’lláh. Now he has judged the time ripe to share this wondrous news with his fellow-believers in all parts of the world, by addressing to the International Bahá’í Convention the gracious and inspiring message of which a copy is enclosed with this letter.…
With loving Bahá’í greetings,
[signed: The Universal House of Justice]

While the Administrative Order publicly eschews involvement in partisan politics, it has no reservations about routinely using its media outlets to proudly tout unelected royal leaders who are Bahá'í.

For example, on February 19, 1968, Malietoa Tanumafili II, one of Samoa's four paramount chiefs, became a Bahá'í.

Also, On April 24, 2017, the Bahá'í World News Service published a story about Djaouga Abdoulaye, who "became a Baha’i in the 1980s when the Faith initially came to Benin." The news report states that he was enthroned High Chief in July of 2016, assuming a "position of moral and customary authority for the approximately 100,000 Fulani living in the area."

Interestingly, while Bahá'ís frequently refer to Queen Marie of Romania as "the first member of a royal family to embrace the Bahá’í Faith," Queen Marie's daughter disputes this claim:

"It is perfectly true that my mother, Queen Marie, did receive Miss Martha Root several times.....She came at the moment when we were undergoing very great family and national stress. At such a moment it was natural that we were receptive to any kind of spiritual message, but it is quite incorrect to say that my mother or any of us at any time contemplated becoming a member of the Baha’i faith."

While rare and not promoted in the media outlets of the Administrative Order, there have been Bahá'ís who have been elected to office, such as Ted Livingston, who was the first Bahá’í in the United States to be the mayor of a city when he was elected Mayor of Cottonwood Falls, Kansas.