Detailed Instructions: In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it, i.e., the proper nouns in the passage. Your job is to determine whether information from more than one term is needed to answer the question. Indicate your choice as `a` for Yes or `b` for No.
Q: Question: What dissident princes crowned him? Passage:The Annals begin with a universal history from the creation of the world until about 1040. This portion of the work is drawn largely from other, earlier annalistic works, particularly those of Saint Bede, Isidore of Seville, and from German traditions like the Annals of Quedlinburg and Weissenburg. From about the date of 1042 onwards, however, the account is Lampert's own and he carries the history from there up to the year 1077, when the Swabian duke Rudolf of Rheinfelden was crowned anti-king by the dissident princes. Lambert's Annales are among the most important sources available for the reign of King Henry IV, the Investiture Controversy, and the Saxon Rebellion in 1073–75. Among the significant events detailed in Lampert's history are the infamous Coup of Kaiserswerth in 1062, Henry's famous Walk to Canossa where he submitted (albeit temporarily) to Pope Gregory VII, and the 1075 Battle of Langensalza where Henry's forces defeated the Saxon and Thuringian rebels. Lambert ended his work with the election of anti-king Rudolf of Swabia, stating that his own account had reached an appropriate conclusion and that another writer would be able to pick up from where he left off in chronicling this new era for the German kingdom (Rudolf was mortally wounded in the Battle on the Elster against Henry's forces in 1080).

A:
a