This henna pattern is derived from 10th century Mozarab artwork.  The Mozarabs were Christians in Spain who spoke Arabic, and enjoyed Arabic culture during the years that Spain was an Islamic country.  The Mozarabs, like their  Jewish and Muslim neighbors, used henna from the 8th century until it was outlawed by the Spanish Inquisition in 1560.  Women arrested by the Spanish Inquisition were charged with the crime of using henna, and were tortured to see whether they would confess to using it secretly in forbidden  heretical acts  (such as bathing, Id, Ramadan, or marriage) or whether they were just using it for beauty. 

Moors and Christians in 11th century Spain loved knotwork ornaments, a fondness shared by their northern neighbors, the Irish, English and Scots. Mozarabic Bibles were ornamented with knotwork, just as Irish Bibles of the period.  Complex knotwork patterns are not difficult ... if you know how.  Want to see how?  Go to : http://www.hennapage.com/henna/how/complexknot.html, and get a free book on knotwork for henna artists!!

This henna is Jamila, mixed with lemon juice, left 12 hours, then terped with cajeput EO, then frozen for a month.  I applied the henna, sprayed it lightly with New Skin, and it was left on several hours with some steaming.  I took this photograph 12 hours after paste removal.