What's the Polygon?, somebody asked me, the other day.
I had no idea.
It's marked on old maps next to Euston Station, they said.
So it is. Look.
In 1799, it stands almost alone at the edge of London, a distinctive shape surrounded by half-built streets and fields.
By 1830, London has appeared around it and the Polygon's distintive shape now sits in Clarendon Square. The empty land just to the left is Rhode's Farm. It will very soon disappear beneath Euston station, one of the many stations to appear along an east-west axis in this part of north London, transforming the area for ever,
In 1862, the unmistakable shape of the Polygon now sits next to the red lines of Euston. Its presence already seems to give Somers Town a new, cramped, more uncomfortable atmosphere.
And now? Like so much of London, all that remains of the Polygon is its name, preserved in memory by Polygon Road. The building itself has disappeared beneath the gargantuan Somers Town estate - one of a string of council estates to be constructed in this hinterland land north of the Marylebone/Euston Road that collectively form the largest estate in Europe.
So what was the Polygon? Was it a theatre? A police station? Some futuristic entertainment palace for Georgian Londoners?
Fittingly for Somers Town, the Polygon was a housing estate, a Georgian building with 15 sides and three storeys that contained 32 houses. It was demolished in the 1890s, by which time Somers Town had become a cheap and run-down neighbourhood, almost entirely because of its location. Railways were loud and smelly places, and they depended upon cheap labour - and that combination was a killer for an area's aspirations.
Two of the most famous residents of the Polygon were William Godwin and his wife Mary Wollstonecraft, who died giving birth to Mary Shelley, the author of Frankenstein. Another former Polygoner was Charles Dickens, who lived at No 17 in the 1820s shortly after his father, John Dickens, was released from debtors prison. Dickens later made the Polygon a home for his 'Bleak House' character Harold Skimpole, and he in turn may well have been modelled on Godwin.