Portman Estate area remained largely residential, attracting the prosperous middle class who wanted to live near the centre of London. There were also mews for tradesmen and servants. At the southwest corner of the Estate, where Marble Arch now stands, was the Tyburn gallows, London’s principal place of public execution until 1783. Development of the area north of the Marylebone Road around Dorset Square continued after 1815, and to the North West in Lisson Green, workers’ cottages were built from 1820 to 1840. Many of the original Georgian houses north of Portman Square were redeveloped as mansion blocks, which were let on
Adorers of the Sacred Heart of Montmartre Arch. Near the convent was the site of Tyburn tree where 105 Catholic martyrs—including Saint Oliver Plunkett and Saint Edmund Campion—were executed during and following the English Reformation from 1535 to 1681. The nuns established at Tyburn the Martyrs' Shrine to honour the more than 350 Catholic Martyrs who were executed in England during and after the Reformation. Tyburn Convent is now the Mother House of the Congregation. Mother Mary of St Peter founded the Adorers to carry out Adoration of the Sacred Heart of Jesus in the exposed Blessed Sacrament, originally in the Basilica of the Sacred Heart at