The Kingdom of Drachenwald was founded in 1993 and is the 13th kingdom for the Society for Creative Anachronism. It is by far the largest kingdom in terms of land area, but it is not the largest in terms of population. Its borders expand to cover all of Europe including the British Isles, Africa and the Middle East.
Glen Rathlin is a Shire within the Principality of Insulae draconis, in the Kingdom of Drachenwald. It is one of the geographical divisions used by the Society for Creative Anachronism. Glen Rathlin covers the six counties of Northern Ireland.
References
Kingdom of Drachenwald Wikipedia(Text) CC BY-SA