The pontiff is from Argentina. He received the sign from Gustavo Hoyo, leader of a campaign for dialogue on the islands, during a papal audience.
A senior Vatican official told the BBC that Pope Francis “did not know and did not realise what was written on it”.
In 1982 UK forces defeated Argentine troops, who had invaded the Falklands.
The war left Argentina and the UK still disputing the islands’ sovereignty – but a UN resolution has called for dialogue to reach a settlement.
The sign held by the Pope on Wednesday said: “It’s time for dialogue between Argentina and the United Kingdom over the Falkland Islands.” *
Landlords in England will be expected to evict tenants who lose the right to live in the UK under new measures to clamp down on illegal immigration.
They will be able to end tenancies, sometimes without a court order, when asylum requests fail, ministers say.
Landlords will also be required to check a migrant’s status in advance of agreeing a lease. Repeat offenders could face up to five years in prison.
But critics have said it may lead to UK citizens being refused accommodation.
The proposals – to be included in the upcoming Immigration Bill – come as the British and French governments struggle to deal with a migrant crisis in Calais, where large numbers of people are making nightly bids to cross the Channel to reach the UK.
Under the proposals for landlords in England, the Home Office would issue a notice when an asylum application fails that confirms the tenant no longer has the right to rent property.