She returned to England in 1759 from
Rotterdam, using the first name of her lover there, Cornelis de Rigerboos, as her surname and presenting herself as Madame Cornelys, a widow; claiming widowhood gave her added respectability and sympathy, but also entailed greater legal rights. In 1760, working through Fermor because she did not yet speak enough English herself, she rented
Carlisle House, a large, well-appointed mansion in fashionable
Soho Square with outbuildings at the rear along a side street, for £180 a year. She had a copper plate set into the foundations with the inscription:Not Vain but Grateful In Honour of the Society [of her first subscribers] and my first Protectress Ye Honble Mrs. Elizabeth Chudleigh is Laid the First Stone of this edifice June 19, 1761 by me Teresa Cornelys. She also extensively refurbished the house, and added sumptuous furnishings. Much of the furniture was hired – the ballroom furnishings alone were valued at £730 – and she had much of the work done on credit or in exchange for large numbers of tickets to her entertainments. She was already having problems with creditors and seizures of furnishings in February 1762. In February 1770, Parliament adjourned early to enable members to attend one of her masquerades.
Laurence Sterne called a visit to Mrs Cornelys' "the best assembly and the best concert I ever had the honour to be at." In
The Expedition of Humphry Clinker, published in 1771,
Tobias Smollett writes of "Mrs. Cornelys' assembly, which for the rooms, the company, the dresses, and decorations, surpasses all description". In
Thackeray's The Luck of Barry Lyndon the narrator recalls that "[a]ll the high and low demireps of the town gathered there".
Dickens wrote in an article on Soho that "the world was dying to be on Mrs. Cornelys's list." For her concerts, she engaged the best musicians available, including
Johann Christian Bach,
Carl Friedrich Abel, Her daughter was well educated at a Catholic convent there. She controlled many details of the events, including who could attend (through a committee of ladies headed by Mrs Chudleigh and including Mary Bertie, wife of the
Duke of Ancaster and Kesteven, who was part of a "racy set" of women keen on partying and heavy spending) and what they were allowed to wear; hooped skirts took up too much room. When the throng outside the house on gala nights led to carriage collisions, she instituted London's first one-way system, stating in her advertising that coachmen must draw up with the heads of the horses towards Greek Street. However, she was a terrible businesswoman, spending more on the events and publicity for them than she took in, hardly ever paying employees or tradesmen on time, continuing to borrow, and with such a poor head for business that people stole from her freely. In January 1771 she began to present operas, including
Artaxerxes by
Thomas Arne, with
Gaetano Guadagni in a leading role. Operatic performances were illegal without a royal licence; Madame Cornelys claimed unsuccessfully that they were charity benefits, as reported by
Horace Walpole:To avoid the Act, she pretended to take no money, and had the assurance to advertise that the subscription was to provide coals for the poor. ... I concluded she would open a bawdy house next for the interests of the Foundling Hospital, and I am not quite mistaken, for they say one of her maids, gained by Mr. Hobart, affirms that she could not undergo the fatigue of making the beds so often. She and Guadagni were fined; at her next operatic presentation she charged extra to cover the fine. She ultimately did apply for a licence, but her application was denied. In her application she states that:[on arriving in England and discovering] that the most extensive, most opulent, and most important City in Europe was the only one of note that had not a settled Entertainment for the select reception and amusement of the Nobility and Gentry, . . . after struggling with a Siege of Troubles during a longer Period than the Siege of Troy [and producing for the nobility and gentry] a species of a more elegant dramatic musical Amusement than any they had ever had before, [she had become embroiled in] vexatious and expensive Prosecutions, as interestedly litigious, as innocently incurred. ==Imprisonment and death==