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The final result saw 432 members of the house against the Prime Minister's agreement for the UK's withdrawal from the European Union. The deal was supported by just 202 MPs.
Parliament was asked to vote after a lengthy debate that has spanned 2018 and 2019 - with a lengthy interval - but eventually decided not to pass through the Prime Minister's deal.
This leaves the Prime Minister - and the whole Brexit process - in a state of uncertainty.
As a result of an amendment put forward by MP Dominic Grieve and voted through by Parliament, Mrs May now has just three days to return to the house with a 'plan B'. So far, almost every possible option is on the table.
However, Labour leader Jeremy Corbyn could put forward a No Confidence Motion (NCM) that may result in a general election.
This NCM can only bring about a general election outside of the standard five-year timeframe if two thirds of MPs vote in favour, or if a vote on the NCM, worded simply 'this House has no confidence in Her Majesty's Government' is won in the Commons within 14 days of the motion being declared.
Other options include a 'No Deal' Brexit, whereby the United Kingdom would leave the EU on 29 March with no formal agreement in place, or even postponing Brexit for an as yet undecided amount of time.
Obviously, the option to put the decision back to the people with a second referendum - or 'People's Vote' - is also still on the table.
On Monday, 129 Members of the European Parliament (MEPs) co-signed a letter to the British public in which they urged the UK not to leave the 28 nation-strong bloc.
The message, organised by Austrian MEP Josef Weidenholzer, said: "We are reluctant to intervene in your domestic politics, but we cannot help but notice that the opinion polls show a growing number of voters who want an opportunity to reconsider the Brexit decision, now that it is clear that Brexit is very different to the promises made by the Leave campaign nearly three years ago.
"Any British decision to remain in the EU would be warmly welcomed by us and we would work with you to reform and improve the European Union, so that it works better in the interests of all citizens."
Outside of these options, there are other less well-known options, such as the Brexit process being handed over to lawmakers, and even a team effort between Labour and the Government, however unlikely that may be.
One thing is for certain, we are not a great deal closer to understanding what will happen to the UK following 29 March 2019.
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