user: Question: Who is the auther when the english name was Histories and Eulogies of the Sovereigns?
Columns: ['English name', 'Georgian name', 'Transliteration', 'Date', 'Author', 'Period covered']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['History of King Vakhtang Gorgasali', 'ცხოვრება და მოქალაქეობა ვახტანგ გორგასლისა', 'tskhovreba da mokalakeoba vakhtang gorgaslisa', '11th century', 'Juansher Juansheriani', '5th–8th centuries']
SQL:

assistant: SELECT "Author" FROM "Table" WHERE "English name" = 'Histories and Eulogies of the Sovereigns';