Temporal region filter

The region ‘Netherlands’ is selected

In addition to the two existing methods for selecting a time period with the When filter, i.e. by defining a range on the time graph with the mouse or by entering a start and end date in the Filter by Year box, a new method has been added, Filter by Time Periods which uses PeriodO named time spans.

Recognising that a defined period such as ‘Medieval’ varies from country to country, Filter by Time Periods allows for one or more regions of interest (Temporal region) to be selected first followed by the selection of one or more named periods (Cultural periods) from those regions thus enabling a period search across defined regions.

Alternatively, if the period is of interest (and the region is incidental), then the Cultural periods section can be used alone. For example, entering ‘Roman’ in the Cultural period text box will result in several matches from countries across Europe.

Each Temporal region in the list displays the number of periods it contains.

Other useful features of both filters is that as well as being able to select from the displayed lists, entering text into the boxes automatically displays all the matches to the entered characters.


Cultural period with information boxEach Cultural period in the list shows the associated region, start year, the numbers of matching resources (hits) and an information icon which, using mouseover, shows further details such as the start and end dates, the native period name and region.

Finally, the Time period graph will also update to display the relevant time span(s) selected and the new Time Periods filter can be used in conjunction with the other filters. However, it should also be noted that this filter will only work for resources that have PeriodO time periods defined in their metadata, the other Dating filter provide a means of searching the large number of period terms used by the data provider.

Go to the Catalogue and try out the filter – in this example, the search term ‘Weapons’ is used with the Culture period filter and all 11 matching Medieval periods, resulting in 481 resources across Europe. The Where map shows where the resources are located (by density) and the When time graph  the distribution of resource dates.