Discovery TV has launched an iPhone version of popular iPad app Timeline Battle Castles.

The new app essentially ports the contents of the iPad app onto the iPhone, offering facts and images from more than 100 European castles, an interactive timeline, film content and a dynamic searchable map of the castles, battles and sieges featured in the app, all presented by historian Dan Snow.

Both iPad and iPhone apps were created by the producers of the Discovery TV series Battle Castle with Dan Snow, and tie into the series itself and the accompanying Harper Collins book Battle Castles – 500 Years of Castles and Siege Warfare.