the Roman commune. As a result, Alexander and his supporters were forced into the sanctuary of the Leonine Borgho. Legacy and assessment In the 14th century Adrian was recorded in St Albans' Book of Benefactors, which, suggests Bolton, "ensured that the memory of the English Pope would remain forever". The 19th-century antiquarian Bishop Stubbs described Adrian IV as, in his view, "a great pope; that is a great constructive pope, not a controversial one, like those who preceded and followed". Walter Ullmann argues that Adrian's pontificate "left an imprint upon contemporary Europe which is not yet fully recognised". One reviewer has described Adrian's pontificate as, traditionally, "largely remembered as the answer to a trivia question (who was the only English pope?) or as a footnote in Anglo-Irish history". On the other hand, the Dixie Professor of Ecclesiastical History, Christopher N. L. Brooke argues that, on account of the number of different countries he dwelt in over the years, he illustrates the cosmopolitan nature of 12th-century religion. The timing of Adrian's pontificate, suggests Ullmann, was significant because it made him the first pope on which what Ullmann calls "newly released forces"—the recently crowned King Henry and Emperor Frederick. On the other hand, argues Egger, Adrian—by rejecting the request of Kings Louis and Henry to crusade in Spain—undoubtedly prevented the secular power from embarrassing themselves: "one can only speculate about what might have happened, but it is not improbable that Adrian spared the Iberian peninsula a disaster on the scale of the second crusade to the East". Morris argues that while "in a short pontificate, Hadrian did more than any of his predecessors to secure the papal position in central Italy...he was much less successful in his conduct of relations with the empire". Norwich too strikes a cautionary note. While agreeing that Adrian was "the greatest pope since Urban II", he argues that it would be difficult not to "tower...above the string of mediocrities who occupied the throne of St Peter during the first half of the century, just as he himself is overshadowed by his magnificent successor". Duggan argues that, although "the future of the papacy was to be determined by other men and other events, but he had played his part in guiding it securely through an extremely critical phase of its long history". Ullmann has called Adrian "diplomatically very well versed and experienced, dispassionate and purposeful in his government".