What is the fine-grained topic of the following text: The current basilica is basically consecrated in 1031 by Patriarch Poppo after the changes made ​​by him (raising of the perimeter walls, renovation of the capitals, apse fresco and construction of the imposing bell tower 73 meters high). Only return the topic.
Renovation and consecration of the current basilica by Patriarch Poppo in 1031.