Queen Victoria

Victoria, by the Grace of God, of the United Kingdom of Great Britain and Ireland Queen, Defender of the Faith, and Empress of India, certainly had a lot of titles. "Jew" was not among them, nor was "Jew-ish," "Barely a Jew," or even "Friend of a Jew." Her reign, however, did coincide with an increase in Jewish emancipation in the UK, so that's something, we guess.

Born Alexandrina Victoria to the Duke and Duchess of Kent, her lineage was about as Gentile as it gets. A thoroughly German Protestant affair, with numerous connections to various European royal houses, most of whom were equally un-Jewish. One might even call it a dynasty of gentiles.

However, she did have a prime minister, Benjamin Disraeli, who was of Jewish descent (though baptized). So, she had some connection, even if it was several degrees removed. And, while she may not have been Jewish herself, at least she wasn't actively persecuting them. A low bar, perhaps, but a bar cleared nonetheless.