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Flag of Bohemia.svg
http://vlastenci.cz/obr/vlajka/vlajka.jpg

Flag of Hungary (1915-1918, 1919-1946).svg
Flag of Hungary from 6 November 1915 to 29 November 1918 and from August 1919 until mid/late 1946.

Flag of Denmark.svg
Dánská vlajka

Flag of England.svg
Vlajka Anglie

Flag of Japan.svg
Japonská vlajka

Flag of China.svg
Vlajka Čínské lidové republiky

Flag of the People's Republic of China.svg
Vlajka Čínské lidové republiky

Royal Standard of the King of France.svg
Autor: Sodacan, Licence: CC BY-SA 3.0
Královská standarda francouzského krále (používaný jako státní vlajka Francouzským královstvím v období absolutní monarchie). Používaná byla v letech 1638 až 1790.

Banner of the Duchy of Brabant.svg
Autor: Samhanin, Licence: CC BY-SA 3.0
Banner of the Duchy of Brabant (1459)

Bosnian Royal Flag of Tvrtko I of Bosnia.svg
Autor: Santasa99, Licence: CC BY-SA 4.0
Bosnian Royal Flag of Tvrtko I of Bosnia

Flag of the Papal States (pre 1808).svg
Flag of the Papal States before 1808.

Flag of Bavaria (striped).svg
Flag of Bavaria (striped)

Early flag of Poland.png
Banner_of_Poland

Banner of the Holy Roman Emperor with haloes (1400-1806).svg
Autor: David Liuzzo, eagle by N3MO, Licence: CC BY-SA 3.0
Banner of the Holy Roman Empire, double headed eagle with halos (1400-1806)

Royal flag of Goryeo (Bong-gi).svg
Royal Flag of the Goryeo dynasty. Flag's name is "Phoenix flag" ( hanja: 鳳旗, 봉기, Bong-gi). This flag is in the War Memorial of Korea.

Flagge Königreich Sachsen (1815-1918).svg
Flag of the Kingdom of Saxony; Ratio (2:3)

Flag of Serbia (1281).svg
Autor: Nikola Smolenski , Licence: CC BY-SA 3.0
The oldest known description of a flag of Serbia is from the 1281 description of a flag in the treasury of King Stefan Vladislav (1233-1243), which was kept in the Dubrovnik Republic. The description lists "vexillum unum de zendato rubeo et blavo" - a flag of fabric red and blue (zendato - čenda a type of light, silky fabric).^[1] We however don't know how were the colours patterned; horizontal diband shown to the left is sometimes used in commemorations of medieval events in Serbia.^[2] As Vladislav ruled from 1233 to 1243 and died after 1264, the flag predates the time of the description, hence making it likely to have been used around the middle XIII century. [1]

Flag of Lorraine.svg
Autor: Patricia.fidi, Licence: CC0
Flag of the region Lorraine in France.

Flag of Croatia (Early 16th century–1526).svg
Autor: Samhanin, Licence: CC BY 3.0
Flag of Croatia (Early 16th century–1526)

Sweden-Flag-1562.svg
Swallow-tailed flag used between the reign of Gustav I of Sweden until c. 1650, when it was succeeded by a triple-tailed flag.

Delhi Sultanate Flag.svg
Flag of the Sultanate of Delhi according to the Catalan Atlas (1375). The flag is grey with a black band in the Catalan Atlas (attached image), not green with a black band as previously uploaded.
The actual grey and black color appears clearly in the primary source (and the Catalan Atlas has plenty of green otherwise, so the grey cannot be a result of color fading), and this interpretation is confirmed by academic sources:

REFERENCE: "....that helps to identify yet another curious flag found in northern India – a brown or originally sliver flag with a vertical black line – as the flag of the Delhi Sultanate (602-962/1206-1555)." in (2010). "On the Timurid flag". Beiträge zur islamischen Kunst und Archäologie 2: 148.

WARNING: This is primary source image, the actual flag is otherwise unknown. The main source pointing to this design is the Catalan Atlas, which as a historical primary source. This image should not be added to articles without clearly attributing its primary source origin, and secondary sources are additionally desired if available (such as the one above). Note that FOTW (where most of those flags on Commons are adapted from) is based on user contributions like Wikipedia, and hence not authoritative.

OVERWRITING OF FICTIONAL FLAG:

The file of the actual grey flag from the Catalan Atlas was overwritten by the uploader over the previous green flag, a hoax that actually cannot be found in the Catalan Atlas. The original file claiming to be the "Flag of the Delhi Sultanate" being a hoax, it was quintessentially false and misled users, and therefore had to be updated with a proper and accurate image. This is following the spirit of the COM:OW rule about "Files with current data" which for example allows to modify the file of a map which has false national boundaries: "Files with current data: (...) However, files may be identified to reusers as ones where information may be updated – these files can and should be overwritten to reflect new information as necessary. (...) A file named "File:Germany location map.svg" is expected to indicate the current boundaries, and is expected to be updated if, for example, the boundaries changed or errors were observed." So a map with false boundaries can, and should be, overwriten: similarly a national flag with a false design can and should be overwritten.

Latin Empire Flag.svg
Autor: David Ll L, Licence: CC BY-SA 4.0
Bandera del Imperio Latino de Constantinopla

Mongol Banner.png
Autor: Dragovit, Licence: CC BY-SA 4.0
This banner is shown in Znamierowski's World Encyclopedia of Flags.

Royal Banner of Norway (14th Century).svg
Autor: Samhanin, Roede (tif file author), Licence: CC BY-SA 4.0
Royal Banner of Norway (14th Century) based on contemporary depictions of flags from Scandinavia and Scotland.