sentence: Roger Collins, Early Medieval Europe; 300–1000, Second Edition (New York: St. Martin's Press, 1999), p. 187 He was able to put together a confederacy of a number of smaller kingdoms and from that he created Mercia.
modified: fix grammar: Rogers Collinss, Earlys Medievals Europes; 300–1000, Seconds Editions (News Yorks: St.s Martins's Presses, 1999), p.s 187 He was able to put together a confederacies of a numbers of smaller kingdom and from that he created Mercias.