Ireland
A united Ireland tag doesnt exist at the start, it needs to be formed by one of the many minors across the isle.


The Irish harp flag is one of the most recognisable symbols of Ireland. In particular the green here is used for when Ireland is formed by Irish culture.

Formed by non-Irish such as the Anglo-Irish or English. The modern Republic of Ireland's presidential flag is based on this design, and it also still features on the British royal banner.

Ireland as a subject of Scotland will adopt the royal tressure.

If the country is Anglican religion it adopts the St Patrick Saltire, currently the symbol of the Church of Ireland.

The revolutionary republic will use Ireland's modern flag. The green represents the Catholics, the orange represents the Protestants, and the white the peace beatween them. The design was based directly on the French revolutionary tricolore.

If the revolution happens to be led by protestants, the will place their colour in the hoist.


England
I guess England deserves a mention.


We start with the famous 3 lions (actually referred to in heraldry as leopards).

Upon winning the Hundred Years War, the English will adopt the ancient fleury French design in the dominant quarter. Historically they adopted this quite early on but we thought it was better as a reward.

The English follow the French fashion of reducing the fleury to 3 fleurs.

If the Capets rule over England they will also change the flag.

The themed flags for the War of the Roses, this one is for the Lancastrians.

This one is for the Yorkists.

If the Tudors emerge victorious, we use this flag . Green, white, and red became dominant colours for England during the Tudor era, and is retained in the modern Welsh flag.

As we enter the 1600s, the St George's cross becomes the favourite.

If ruled by a Scandinavian culture, why not a Nordic cross?