Václav Havel in the context of "Bourgeois"

A letter of credence (French: Lettre de créance, [lɛtʁ də kʁeɑ̃s]) is a formal diplomatic letter that designates a diplomat as ambassador to another sovereign state. Commonly known as diplomatic credentials, the letter is addressed from one head of state to another, asking them to give credence (French: créance) to the ambassador's claim of speaking for their country. The letter is presented personally by the ambassador-designate to the receiving head of state in a formal ceremony, marking the beginning of the ambassadorship.

Letters of credence are traditionally written in French, the lingua franca of diplomacy. However, they may also be written in the official language of the sending state.

Nonviolent resistance, or nonviolent action, sometimes called civil resistance, is the practice of achieving goals such as social change through symbolic protests, civil disobedience, economic or political noncooperation, satyagraha, constructive program, or other methods, while refraining from violence and the threat of violence. This type of action highlights the desires of an individual or group that feels that something needs to change to improve the current condition of the resisting person or group.

Mahatma Gandhi is the most popular figure related to this type of protest; United Nations celebrates Gandhi's birthday, October 2, as the International Day of Non-Violence. Other prominent advocates include Abdul Ghaffar Khan, Henry David Thoreau, Etienne de la Boétie, Charles Stewart Parnell, Te Whiti o Rongomai, Tohu Kākahi, Leo Tolstoy, Alice Paul, Martin Luther King Jr., Daniel Berrigan, Philip Berrigan, James Bevel, Václav Havel, Andrei Sakharov, Lech Wałęsa, Gene Sharp, Nelson Mandela, Jose Rizal, and many others. From 1966 to 1999, nonviolent civic resistance played a critical role in fifty of sixty-seven transitions from authoritarianism.

Visegrád (Hungarian: [ˈviʃɛɡraːd]; German: Plintenburg; Latin: Pone Navata or Altum Castrum; Slovak: Vyšehrad) is a castle town in Pest County, Hungary. It is north of Budapest on the right bank of the Danube in the Danube Bend. It had a population of 1,864 in 2010. The town is the site of the remains of the Early Renaissance summer palace of King Matthias Corvinus of Hungary and a medieval citadel. The town was also the site of a meeting on 15 February 1991 between the President of the Czech and Slovak Federative Republic, Václav Havel, the President of the Republic of Poland, Lech Wałęsa, and the Prime Minister of the Republic of Hungary, József Antall which founded the titular Visegrád group.

The Black Ribbon Day, officially known in the European Union as the European Day of Remembrance for Victims of Stalinism and Nazism and also referred to as the Europe-wide Day of Remembrance for the victims of all totalitarian and authoritarian regimes, is an international day of remembrance for victims of totalitarianism regimes, specifically Stalinist, communist, Nazi and fascist regimes. Formally recognised by the European Union, the Organization for Security and Co-operation in Europe and some other countries, it is observed on 23 August. It symbolises the rejection of "extremism, intolerance and oppression" according to the European Union. The purpose of the Day of Remembrance is to preserve the memory of the victims of mass deportations and exterminations, while promoting democratic values to reinforce peace and stability in Europe. It is one of the two official remembrance days or observances of the European Union, alongside Europe Day. Under the name Black Ribbon Day it is an official remembrance day of Canada. The European Union has used both names alongside each other.

The remembrance day has its origins in Cold War-era protests in Western countries against the Soviet Union, which gained prominence in the years leading up to the Revolutions of 1989 and that inspired the 1989 Baltic Way, a major demonstration where two million people joined their hands to call for an end to the Soviet occupation. Canadian and other Western communities of refugees from the Soviet Union were instrumental in establishing the remembrance day in 1986. It was proposed as an official European remembrance day by Václav Havel, Joachim Gauck and a group of human rights activists and former political prisoners from Central and Eastern Europe during a conference organised by the Czech Government, and was formally designated by the European Parliament in 2008/2009 as "a Europe-wide Day of Remembrance for the victims of all authoritarian and totalitarian regimes, to be commemorated with dignity and impartiality"; it has been observed annually by the institutions of the European Union since 2009. The European Parliament's 2009 resolution on European conscience and totalitarianism, co-sponsored by the European People's Party, the Alliance of Liberals and Democrats for Europe, The Greens–European Free Alliance, and the Union for Europe of the Nations, called for its implementation in all of Europe. The establishment of 23 August as an international remembrance day for victims of totalitarianism was also supported by the 2009 Vilnius Declaration of the OSCE Parliamentary Assembly.