To give one example, Carpani asserts that Haydn did not bring his mistress Luigia Polzelli to London with him in his journey of 1791 because she had died; in fact, she lived on for decades, was the recipient of letters from Haydn, and received a small pension from him.
An important part of Haydn's job at Eszterháza was to put on productions of operas by other composers.
Haydn was also conducting a long term love affair with the singer Luigia Polzelli, but this may have been fading, in light of the fact that two years later Haydn did not bring Luigia with him on his first visit to London.
Haydn was also in the breakup phase of a long-term relationship with the singer Luigia Polzelli, whom he had not brought to London with him.