"Zelia Trebelli-Bettini (1836–1892) also known as Zelia Gilbert or by her stage name Trebelli, was a French opera singer.Mme Trebelli´s artistry was greatly admired by George Bernard Shaw, who wrote about her a number of times in his various reviews. In particular, he admired her interpretations and her exemplary English diction, rare for a non-native English speaker.
Her daughter Antonia (originally Antoinette) Dolores Trebelli (c. 1864 – ) was a distinguished soprano, and as "Mademoiselle Dolores" was well received in Australia and New Zealand." - (Wikipedia (en) 09.03.2020)
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