 Roger was consecrated Archbishop of York on 10 October 1154 . When he went north to York , the legal scholar Vacarius , who had been part of Theobald 's household , followed Roger and spent the next 50 years in the north . Vacarius was responsible for introducing Roman civil law into England , and did so under the patronage of Roger . He wrote a standard textbook on the civil law , the Liber pauperum , and was an important advisor for Roger . 
