San Gregorio Magno al Celio
On March 10 , 2012 , the 1 , 000th anniversary of the founding of the Camaldolese in 1012 was celebrated here at a Vespers service attended by Anglican and Catholic prelates and jointly led by Pope Benedict XVI and Rowan Williams , Archbishop of Canterbury . 
<triplet> Rowan Williams <subj> Archbishop of Canterbury <obj> position held