Alfie Mawson celebrates opening the scoring in Swansea 2-0 win over Leicester
History counts for nothing, however, and Leicester were undone by somebody who was barely playing in League One at that time.
The stunning strike from former Barnsley defender Alfie Mawson was enough to set Swansea on their way to three points against a relegation-threatened team that used to tear up the rest of the Premier League for breakfast. Didn't they?
The only member of the starting line-up missing from that team who thrashed City last season was a certain N'Golo Kante.
Ten of the starters against Swansea also played in that famous win – Wilfried Ndidi, the £15million man from Genk bought as soon as the most recent transfer window opened in a belated attempt to fill some of the hole that Kante had left.
But Kante's was not the only absence from Leicester 12 months on. There was an absence of belief; an absence of threat; an absence of energy.
Mawson scoring a stunning volley in the win over Leicester at the Liberty Stadium
It was more that once the protective blanket of such a remarkable midfielder's contribution was removed, it exposed the awful truth. Or was that the awful Huth?
Together with Wes Morgan, Robert Huth was trumpeted as a foundation of Leicester's achievements last season.
Now, once again, they look like what they were when they arrived – aging, crumbling, bargain basement defenders overstretched by their efforts to keep the whole house in order.
Just three minutes into the game and the pair were in trouble. A tentative header clear by Morgan was fired back in by Gylfi Sigurdsson and hit his arm. Luckily, it was just close enough to his body to persuade referee Jon Moss not to point to the spot.
Swansea dominated possession but then that is the Leicester way. Although Danny Drinkwater, whose long raking passes unlocked so many defences on the counter last season, proved more of a threat to his own goal, flicking the ball just wide of his far post from an inswinging free-kick.
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Martin Olsson celebrates scoring Swansea's second goal against Leicester
These days Leicester seem to be content to land their long balls vaguely in the same postcode area as Jamie Vardy and expect the striker to get on with it. Unsurprisingly, his internal satnav cannot take the pressure and, frankly, he looks lost.
Swansea always looked the more dangerous – although try telling that to Tom Carroll, who suffered an agricultural tackle from Huth when the defender once again arrived just a fraction later to a challenge than he would have done last season.
The resulting free-kick was chipped forward and Huth struggled to clear. Federico Fernandez nodded the ball simply back into the box and Mawson met it with such a thumping volley into the back of the net that the impact could be heard at the back of the Liberty Stadium stands.
There was still time for things to get worse before the break. Paul Clement is building his Swansea side around some enterprising, instinctive footballers and the interplay between Jack Cork, Fernando Llorente, Sigurdsson and Olsson deserved a goal.
Such is the way of things for Leicester at the moment that the usually impeccable Kasper Schmeichel allowed Olsson to arrow his shot, sure enough, inside his near post.
Dilly-ding-dilly-dong suddenly took on a new significance. It was time for Ranieri to ring the changes.
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Two substitutes at the break contributed to an improved second-half performance and at the same time Ndidi began to assert himself more on the Premier League and Demarai Gray looked intent on cementing his promotion from Leicester's FA Cup tie with some enterprising runs.
Even Riyad Mahrez finally made an appearance after drifting through the opening 45 minutes, pushing the ball into the path for Islam Slimani in the 63rd minute only for the quick-thinking Lukasz Fabianski to snuff out the chance with his boot.
Indeed, one-to-11 Swansea were cute enough to hold on – a fair indication that the decision to bring in Clement was – after the disaster of Bob Bradley – an inspired one.
Somehow, Ranieri has to continue ringing those changes going forward to safeguard Leicester's own Premier League future.
As this latest demise of last year's conquerors of Manchester City showed once again, he can no longer afford to live in the past.
SWANSEA (4-4-2): Fabianski 7; Naughton 6, Fernandez 7, Mawson 8, Olsson 7; Fer 6, Cork 7, Carroll 7, Dyer 5 (Routledge 7, 6 (Narsingh 89)); Llorente 6 (Ayew 72, 6), Sigurdsson 7. Booked: Cork. Goals: Mawson 36, Olsson 45.
LEICESTER (4-4-2): Schmeichel 5; Simpson 6 (Amartey 70, 5), Huth 5, Morgan 5, Fuchs 6 (Chilwell 45, 5); Mahrez 5, Drinkwater 6, Ndidi 7, Albrighton 5 (Slimani 45, 6); Gray 7, Vardy 5. Booked: Huth, Chilwell.
Referee: J Moss (West Yorkshire).