Final answer:
Archbishop Usher was known for his family's ancient lineage and artistic sensibility. He had a reserved nature, and towards the end, he showed signs of madness or mental instability.
Step-by-step explanation:
Archbishop Usher was known for his family's ancient lineage and their artistic sensibility and charitable works. He was particularly passionate about musical science. The Usher family had a unique tradition of direct descent, without any enduring branches, and this contributed to the identification of their family name with their estate, known as the 'House of Usher.'
Usher's detailed historical analysis and biblical interpretation led him to conclude that the Earth was created in 4004 BC, a date that was for a long time included in the margins of the King James Bible. His chronology was a significant contribution to the 17th-century theological and scientific debates on the age of the Earth.
While there is no specific information available about what Archbishop Usher thought, it can be inferred from the given passage that he had a reserved nature and showed signs of madness or mental instability towards the end.