Rijnsburg (Dutch: [ˈrɛinzbʏr(ə)x] ⓘ) is a village in the eastern part of the municipality of Katwijk, in the western Netherlands, in the province of South Holland.

Rijnsburg Abbey was established by Petronilla of Lorraine, consort of Floris II, Count of Holland, in 1133.

In 1913 a buckle, the mount with red, white and blue enamel, and the square coin were found together in a cemetery at Rijnsburg.

The impressive gilded buckle with interwoven filigree and enamel inlay was probably made in Kent (England) across the Channel.

These finds amongst others indicate that the mouth of the Rhine was home to some people of very high status, perhaps even royalty.