The main source of this dataset is an authentic copy of the 1742 tax register of Leiden. The 1742 tax register of Leiden contains information on the assets of inhabitants of Leiden liable for tax per "bon" (neighbourhood). The tax register mainly concerns the Leiden elite. The original format of the dataset is a Microsoft Access '97 filedatabase containing 35 variables/fields, including among others: profession, the number of servants employed, assets (estate, vehicles, income), tax category ("klasse") and tax assessment. The original Microsoft Access database file has been converted to a comma separated value file format (.csv / delimiter: semi-colon).