Marquess of Sligo is in Marquis and Marquess Ireland.
In 1800 John Denis Browne 1st Marquess of Sligo [aged 43] was created 1st Marquess of Sligo.
On 2nd January 1809 John Denis Browne 1st Marquess of Sligo [aged 52] died. His succeeded son Howe [aged 20] succeeded 2nd Marquess of Sligo.
On 26th January 1845 Howe Browne 2nd Marquess of Sligo [aged 56] died. His succeeded son George [aged 24] succeeded 3rd Marquess of Sligo.