Ten things you didn't know about...Dunbartonshire

Dunbarton's most recognisible feature is the large volcanic plug that towers over it from the River Clyde, Dunbartonshire's major river. Because some people think it looks like an elephant from certain angles, an elephant with a castle on its back became the main feature of both the town's coats of arms and the local football club's insignia.

The Singer factory in Clydebank, Dunbartonshire, produced 36 million sewing machines from its opening in 1884 until 1943. It was actually the third Singer factory in Scotland, after neither of the earlier facilities in Glasgow and then Bridgeton Cross could keep up with the enormous demand.

Clydebank shipyard, originally known as John Brown & Co, was arguably the most significant shipyard in the world. Its roll-call of internationally important vessels include the Lusitania, the Queen Mary, and the original Queen Elizabeth, not to mention war ships like the Hood. The QE2, in 1967, was the last major ship to be built there.

The longest-lasting shipyard in Dumbarton was Denny's, which produced, among many others, the Cutty Sark. The Dunbartonshire ship builders first arrived in the early 1800s and in 1818 built the Rob Roy, the first steam-powered ferry regularly to cross the English Channel.

Dumbarton was the centre of the ancient kingdom of Strathclyde from the fifth century until 1018. Sitting on volcanic rock overlooking the Firth of Clyde, it was an important royal refuge. Dumbarton Rock itself is part of a geological feature that stretches to the Grampians.

For more than 20 years, the Romans under Emperor Antoninus Pius used a series of ramparts known as the Antonine Wall as the border of its northwest frontier in the British isles. Crossing the narrowest part of Britain at the Forth-Clyde isthmus, it was built around 142 AD but abandoned in the 160s when Hadrian's Wall was reinstated as the preferred boundary point.

The old county of Dunbartonshire, also known as Dumbarton, Dumbartonshire and Dunbarton, was abolished in 1975. In 1996 East Dunbartonshire Council and West Dunbartonshire Council were created.

Having turned 25 just three months earlier, Jo Swinson became the youngest MP in Parliament when she took the Dunbartonshire East seat for the Lib Dems from Labour at the 2005 general election.