Sentence:  The second is a chapel of two storeys, the lower dating from 1150, while the upper was rebuilt in the 15th century, and there is a rich <WSD>Flamboyant</WSD> entrance with a stairway (1533). 
Meaning of the word marked with <WSD> tags:  Referring to the final stage of French Gothic architecture from the 14th to the 16th centuries.