John Warner was an English merchant who was Lord Mayor of London

Lord Mayor of London

The Right Honourable Lord Mayor of London is the legal title for the Mayor of the City of London Corporation. The Lord Mayor of London is to be distinguished from the Mayor of London; the former is an officer only of the City of London, while the Mayor of London is the Mayor of Greater London and...

 in 1647.

Warner was a city of London merchant and a member of the Worshipful Company of Grocers

Worshipful Company of Grocers

The Worshipful Company of Grocers is one of the 108 Livery Companies of the City of London. It is ranked second in the order of precedence of the Companies and, having been established in 1345, is one of the original Great Twelve City Livery Companies....

. He was Sheriff of London from 1639 to 1640. On 12 March 1640, he was elected an alderman of the City of London for Queenhithe

Queenhithe

Queenhithe is a small ward of the City of London, situated on the River Thames and to the south of St Paul's Cathedral. The Millennium Bridge crosses into the City at Queenhithe....

 ward. From 1642 to about 1645, he was a colonel in the Green Regiment. In 1647, he was elected Lord Mayor of London

Lord Mayor of London

The Right Honourable Lord Mayor of London is the legal title for the Mayor of the City of London Corporation. The Lord Mayor of London is to be distinguished from the Mayor of London; the former is an officer only of the City of London, while the Mayor of London is the Mayor of Greater London and...

.