number, from Meyerbeer's Ein Feldlager in Schlesien (The Camp of Silesia, 1844, a role written for Lind but not premiered by her) became one of the songs most associated with Lind, and she was called on to sing it wherever she performed in concert. Her operatic repertoire included the title roles in Lucia di Lammermoor, Maria di Rohan, Norma, La sonnambula and La vestale as well as Susanna in The Marriage of Figaro, Adina in L'elisir d'amore and Alice in Robert le diable. About that time, she became known as "the Swedish Nightingale". In December 1845, the day after her debut at the Leipzig Gewandhaus under the baton of Mendelssohn, she sang without fee for a charity concert in aid of the Orchestra Widows' Fund. Her devotion and generosity to charitable causes remained a key aspect of her career and greatly enhanced her international popularity even among the unmusical. At the Royal Swedish Opera, Lind had been friends with the tenor Julius Günther. They sang together both in opera and on the concert stage and became romantically linked by 1844. Their schedules separated them, however, as Günther remained in Stockholm and then became a student of Garcia in Paris in 1846–1847. After reuniting in Sweden, according to Lind's 1891 Memoir, they became engaged to marry in the spring of 1848, just before Lind returned to England. However, the two broke off the engagement in October of the same year. After a successful season in Vienna, where she was mobbed by admirers and feted by the Imperial Family, Lind traveled to London and gave her first performance there on 4 May 1847, when she appeared in an Italian version of Meyerbeer's Robert le diable. It was attended by Queen Victoria; the next day, The Times wrote: We have had frequent experience of the excitement appertaining to "first nights", but we may safely say, and our opinion will be backed by several hundreds of Her Majesty's subjects, that we never witnessed such a scene of enthusiasm as that displayed last night on the occasion of Mademoiselle Jenny Lind's début as Alice in an Italian version of Robert le diable. Queen Victoria attended each of Lind's sixteen debut performances in London. In July 1847, Lind starred in the world première of Verdi's opera I masnadieri at Her Majesty's Theatre, under the baton of the composer. During her two years on the operatic stage