 Henry's allies deserted him, and he finally had to submit in November 1181 at an Imperial Diet in Erfurt.He was exiled from Germany in 1182 for three years, and stayed with his father-in-law in Normandy before being allowed back into Germany in 1185.At Whitsun 1184 he visited the Diet of Pentecost in Mainz , probably as a mediator for his father-in-law Heinrich II.