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The loudest night yet at Alexander Stadium was when England's Katarina Johnson-Thompson and Scotland's Eilish McColgan won the gold and silver medals, respectively.
After three years of injury and coaching changes, Johnson-Thompson is back at the top of her game.
She finished with 6,377 points, beating Kate O'Connor by a wide margin.
At the age of 31, she is the first major title winner.
Her mother Liz won the same title at Edinburgh 1986 and New Zealand 1990.
As the volume rose and the laps counted down, the two of them were locked together.
With 250m to go, Cheptai opened up a one-metre lead.
After checking over her shoulder for a response that didn't come, she landed her biggest win yet.
"This is the most amazing time of my life," he said.
In that last 100m the crowd carried me, I couldn't hear myself thinking or breathing.
It's been an up and down year with Covid and a few other things. I knew I was in good shape but I didn't want my family to go somewhere else.
Liz paid tribute to her daughter's dedication and determination before embracing her.
She said it was amazing to see her daughter win.
I knew she was capable of running. She put it together tonight after a long time, and it was amazing to watch.
She ran faster than her mother did.
Her time of 30 minutes 48.60 seconds is a Games record and adds gold to the season.
She broke a number of records this year, but an injury prevented her from competing at the World Championships.
Johnson-Thompson dedicated her gold to her grandmother Mary who died last week, after a run of bad luck and behind- the-scenes disruptions.
It has been a tough couple of years for Johnson-Thompson and he hopes this can start a new chapter in his career.
I had moments where I didn't know if I wanted to keep going but to come out here and get the gold and prove to myself that pushing through was worth it.
Johnson-Thompson came into the 800m finale with a healthy lead over O'Connor, but left nothing to chance as she sprinted to the line to win by more than half a second.
It was in the javelin that Johnson-Thompson saw off the pretenders to her throne.
The 29-year-old is most at risk in the throwing events. She hadn't been close to her personal best of 43.93m since she threw it.
O'Connor's opening-round 50.83m, in response to Johnson-Thompson's 36.19m, put pressure on the defending champion.
Johnson-Thompson clasped her face in her hands after a final round of 44.33m.
After her spell of faltering form and fitness, it was a performance she had never thrown before.
Johnson-Thompson took silver with 6,212 points.
Wales' three-time Paralympian Aled Sion Davies won F42-44/61-64 discus gold, with teammate Harrison Walsh taking bronze.
Davies' best effort of 51.39m was short of the F42 discus world record of 56.21m he set in July, but was good enough to justify his decision to switch to the event.