Final answer:
The question seems to be a mix-up of historical events and the information provided does not accurately relate to any known incidents in Mozart's life. Therefore, no specific answer can be provided based on the information given.
Step-by-step explanation:
No specific incident involving the death of a person during a visit of Mozart and his wife is widely recorded or known in historical accounts. The question seems to be referring to a historical period and events, but the provided examples do not correspond to any known events in Mozart's life. Understanding the context of the deaths discussed in the reference material provided, they relate to different individuals and times, such as Petrarca's contemporaries and family members in the 14th century, the English monarch's family in the 17th century, and other disparate historical and literary references which are unrelated to Wolfgang Amadeus Mozart.