"Fludd's apology for the Brotherhood of the Rosy Cross was first issued in 1616, being printed in Leyden. It "entitles him to be regarded as the high priest of their mysteries." It is said that Maier visited Fludd in London in 1615, and the result of his visit was, we know, the publication of his 'Apologia,' written in Latin, and published in Leyden in 1616."