Quarterly: 1st and 4th grandquarters: Per bend dancetty Azure and Or a Bend invected between three Crosses Patée in chief and as many Horseshoes in base all counterchanged (Bigham);2nd grandquarter:1st and 4th, Ermine, on a Bend Azure, a Magnetic Needle, pointing to the Polar Star Or (Petty); 2nd and 3rd, Argent, a Saltire Gules, and a Chief, Ermine (FitzMaurice); 3rd grandquarter: 1st, Parted per pale Sable and Argent on a Chaplet four Quatrefoils counterchanged (Nairne); 2nd counterquartered: 1st and 4th, Or on a Fess Gules between three Crosses Patée in chief of the second a Mullet Azure in base three Bezants (Mercer); 2nd and 3rd, Argent a Chevron Sable between three Boars' Heads erased Gules (Elphinstone); 3rd counterquartered:
1st and 4th, Paly of six Or and Sable (Atholl); 2nd, Or a Fess chequy Azure and Argent (Stewart); 3rd, Azure three Mullets Argent within a Double Tressure flory counterflory Or (Murray); 4th, Argent three Martlets Sable (de Flahault).
Viscount Mersey, of Toxteth in the County Palatine of Lancaster, is a title in the Peerage of the United Kingdom. It was created in 1916 for the lawyer and politician John Bigham, 1st Baron Mersey. He had already been created Baron Mersey, of Toxteth in the County Palatine of Lancaster, in 1910, also in the Peerage of the United Kingdom. His son, the second Viscount, was a Deputy Speaker of the House of Lords and also served as Liberal Chief Whip in the House of Lords from 1944 to 1949. His son, the third Viscount, married Katherine Petty-Fitzmaurice, 12th Lady Nairne, the eldest daughter of Henry Petty-Fitzmaurice, 6th Marquess of Lansdowne and 10th Lord Nairne. They were both succeeded by their son, the fourth Viscount Mersey and thirteenth Lord Nairne. As of 2017[update] the titles are held by the latter's son, the fifth Viscount, who succeeded in 2006.
William Petty-Fitzmaurice 1737–1805 1st Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 2nd Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe
John Henry Petty 1765–1809 2nd Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 3rd Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe
Viscountcy Keith and Barony Keith (1st creation) extinct, 1801
Henry Petty-Fitzmaurice 1780–1863 3rd Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 4th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe 4th Earl of Kerry, 24th Baron Kerry
Baronies Keith (2nd & 3rd creations) extinct, 1867
Henry Thomas Petty-Fitzmaurice 1816–1866 4th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 5th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe 5th Earl of Kerry, 24th Baron Kerry
Henry Charles Keith Petty-Fitzmaurice 1845–1927 5th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 6th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 6th Earl of Kerry, 24th Baron Kerry, 9th Lord Nairne
Henry William Edmund Petty-Fitzmaurice 1872–1936 6th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 7th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 7th Earl of Kerry, 25th Baron Kerry, 10th Lord Nairne
Charles Hope Petty-Fitzmaurice 1917–1944 7th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 8th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 8th Earl of Kerry, 26th Baron Kerry, 11th Lord Nairne
George John Charles Mercer Nairne Petty-Fitzmaurice 1912–1999 8th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 9th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 9th Earl of Kerry, 27th Baron Kerry
David Edward Hugh Bigham b. 1938 Heir apparent to the Viscountcy Mersey
Charles Maurice Petty-Fitzmaurice b. 1941 9th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 10th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 10th Earl of Kerry, 28th Baron Kerry
