A mix of databases and useful weblinks on Art History
Specifically about the Middle Ages:
Below you find several dictionaries for interpreting and translating texts.
More reference works in the field of art & architecture via Oxford Reference.
In Nexis Uni, a newspaper database, you can read articles from newspapers and news magazines from all over the world. For example Dutch, English, American, French, German and Spanish papers. Usefull when you want to stay informed about language, literature, culture and politics.