It was thought for some time that the earliest mention of the piano is from a diary of Francesco Mannucci, a Medici court musician, indicating that Cristofori was already working on the piano by 1698. However, the authenticity of this document is now doubted.[7] The first unambiguous evidence for the piano comes from the 1700 inventory of the Medici mentioned in the preceding section. The entry in this inventory for Cristofori's piano begins as follows: