Newcastle

1st Duke of, Pelham-Holles, Thomas.
Also called Newcastle-upon-Tyne
[noo-kas-uh l-uh-pon-tahyn, -uh-pawn-, -kah-suh l-, nyoo-] /ˈnuˌkæs əl əˌpɒnˈtaɪn, -əˌpɔn-, -ˌkɑ səl-, ˈnyu-/ (Show IPA). a seaport in Tyne and Wear, in NE England, on the Tyne River: shipbuilding; major coal center.
a seaport in E New South Wales, in SE Australia.
a town in SE Ontario, in S Canada, NE of Toronto, on Lake Ontario.
carry coals to Newcastle,

to take something to a place where its kind exists in great quantity.
to do something wholly unnecessary.

Contemporary Examples

Sister Eugenie, 22, will lose her official guards when she finishes her degree at Newcastle University this year.
The Easing Out of Princess Beatrice Continues Tom Sykes April 2, 2012

In this Newcastle Brown Ale ad, gangly British comedian Stephen Merchant posits, ‘What if the Brits won the Revolutionary War?’
Will Ferrell Soccer Speech, Cliff Dive Slip ‘N Slides, and More Viral Videos Alex Chancey June 28, 2014

Bars as far as Vancouver and Newcastle, in the U.K., also have sworn to stop serving Stoli.
Russian Vodka Boycott Spreads Over Kremlin’s New Anti-Gay Laws Eliza Shapiro July 29, 2013

Hailed by some critics in Britain, where Graham is a professor at Newcastle University, it deserves more attention stateside.
Our Favorite Books of 2012: Tina Brown, Andrew Sullivan, and Others’ Picks The Daily Beast December 10, 2012

I’ve done a stage show up in Newcastle and the odd day of filming, dramatized documentaries.
Meet ‘Inspector Lewis’: Kevin Whately on ‘Morse,’ John Thaw, and the End of the Series Jace Lacob June 13, 2013

Historical Examples

While still a young man, he ranked among the poetical contributors to the Newcastle Magazine.
The Modern Scottish Minstrel, Volume V. Various

But the other was a farmer’s son; and learned his trade in the back shops of Newcastle.
Ariadne Florentina John Ruskin

Ay, so we said when you lost that fight with Newcastle Jemmy, and sent us home all poor men.
The Works of Robert Louis Stevenson, Volume XV Robert Louis Stevenson

In the Newcastle dialect, a chare is a narrow street or lane.
Lives of the Engineers Samuel Smiles

From thence on board the Newcastle, to show my Lady the difference between a great and a small ship.
Diary of Samuel Pepys, Complete Samuel Pepys

noun
a port in SE Australia, in E New South Wales near the mouth of the Hunter River: important industrial centre, with extensive steel, metalworking, engineering, shipbuilding, and chemical industries. It suffered Australia’s first recorded fatal earthquake, in 1989. Pop: 279 975 (2001)
noun
Duke of, the title of Thomas Pelham Holles. 1693–1768, English Whig prime minister (1754–56; 1757–62): brother of Henry Pelham
see: carry coals to Newcastle