Who is Labour's new Newport West MP Ruth Jones? is the new Member of Parliament for Newport West.
She won 9,308 votes and a majority of 1,951 over the Conservatives who were in second place, significantly down on Paul Flynn's majority of more than 5,000 votes.
Turnout was 37.1%, down 30% from the snap election in 2017 when turnout was 67.5%.
It was also considerably lower than the 2016 National Assembly election (44.7%) and the 2015 General Election (64.9%).
Ukip had hoped for a rapid rise in support, up from the 2.5% vote share they secured in 2017.
Candidate Neil Hamilton had said during the count that he hoped for the party to have secured double digit percentage but only secured around 8% of the vote, far short of the Conservatives.
Who is Labour's new Newport West MP Ruth Jones?
Mrs Jones said: "Now you have elected me I will do exactly what I promised on the doorsteps.
"I will stand up for the people, the jobs and the economy of Newport West.
"Who knows what the next few days, weeks and months will bring. But what I know for certain, is that people have had enough after a decade of austerity.
"They've had enough of cuts that have taken police off our streets, enough of being made to feel worthless by cuts from universal credit and the bedroom tax.
Watch Mrs' Jones' speech at the by-election last night:
She told her supporters: "If I'm going to Parliament it's with Newport in my heart and those people in my mind."
She thanked her family, including husband David, and children Aled and Eleanor.
Joking to her children, she told them: "If you think I've been an embarrassing mum until now, you ain't seen nothing yet".
Labour leader Jeremy Corbyn congratulated his newest MP on Friday morning, sending his warmest congratulations.
"This was always going to be a difficult by-election at a time when people are disillusioned with Westminster politics and the Tories' failure to negotiate a Brexit deal.
"However, last night's result demonstrates that the people of Newport and Wales are rejecting austerity and know that Labour is offering a real alternative.
"Labour will reverse Conservative cuts and support the Welsh Labour government and First Minister Mark Drakeford to rebuild communities like Newport with proper investment to create a society that works for the many, not the few."
The by-election was called after the death of Paul Flynn.
Mr Flynn had held the seat since 1987, and the last time it was held by anyone other than Labour was when Mark Robinson was elected in 1983.
In the 2017 snap election, Labour took 52.3% of the votes, with 39.3% to the Conservative candidate.
In 2015, Mr Flynn had an 8.7% more of the vote compared to the Conservative candidate.
The count took place at the Geraint Thomas National Velodrome of Wales.
The Conservative candidate, Matthew Evans, said it was his ninth election in Newport.
In a pre-prepared speech, he said he had "never known such anger and frustration".
That was reflected in the turnout, he said.
"People just want clarity and I've seen no appetite for another election or referendum."
Mr Evans said that while it was disheartening to lose an election, he was "incredibly proud" of the campaign which had been run.
Neil Hamilton came third, upping the Ukip vote share to 8.6%.
In his speech after his eighth campaign, Mr Hamilton said: "When I started this election we were on 2.5% that's what I inherited from 2017, and I thought we'd be doing very well if we saved our deposit and we'd doing exceptionally well if we got 8% which is roughly the threshold that we need to elect a member in each region list in the Assembly elections.
"To quadruple or nearly quadruple our vote, I regard as a success".
The vote tallies:
Jonathan Clark (Plaid Cymru) - 1,185
June Davies (Renew) - 879
Matthew Evans (Conservative) - 7,357
Neil Hamilton (UKIP) - 2,023
Ruth Jones (Labour) - 9,308
Ryan Jones (Liberal Democrats) - 1,088
Ian McLean (SDP) - 202
Hugh Nicklin (For Britain) - 159
Richard Suchorzewski (Abolish the Welsh Assembly Party) - 205
Philip Taylor (Democrats and Veterans) - 185
Amelia Womack (Green Party) - 924
How the parties fared compared to 2017:
Welsh Labour: 39.6% (down 12.7% from 52.3% in 2017)
Welsh Conservatives: 31.3% (down 8% from 39.3% in 2017)
Ukip Make Brexit Happen: 8.6% (up from 2.5% in 2017)
Plaid Cymru - 5% (up from 2.5% in 2017)
Welsh Liberal Democrats - 4.6% (up from 2.2% in 2017)
Green Party - 3.9% (up from 1.1% in 2017)
Other parties which did not previously stand:
Social Democratic Party (0.9%), For Britain Movement (0.7%), Abolish the Welsh Assembly Party (0.9%), Democrats and Veterans Party (0.8%), Renew (3.7%).
