Philip V's Spanish Flags (5)

Following the reasonings of my former post, let's take the Regimiento de Castilla for instance. Prior to Philip V's reformations, when still organized as a Tercio, this veteran infantry unit was known as the Tercio de los Morados Viejos (that is, Old Purples), a name granted in 1693. By these times, Spanish Infantry units still flew several flags besides of the Colonel's colour, one for each company --this is why these were called Banderas Capitanas, or Captain Flags. Well, the fact is that Captain Flags of Old Purples are known, and were as shown at the left: a regular Burgundy Cross on a yellow field.

After Philip V's reformations during 1706-1707, the unit was renamed as Castile Infantry Regiment and, as discussed before, was assigned Batalion flags replacing the former Company ones, following the pattern already explained --consisting of a plain Burgundy Cross on a background coloured according to the Coat of Arms of the province giving its name to the Regiment.

Following my hypothesis, we should only find out the Coat of Arms of Castile province by the start of 18^th century, and then we should know the corresponding flag background. This is quite a simple case, for the Arms of Castile haven't changed since late 12^th century, showing a golden castle with blue gate and windows on a red field --as depicted in the image right.

According to the pattern described in King Philip's ordnances and shown in the ever reproduced Regimiento de Aragón flag, we then would assign a plain red background to the Battalion Flag of Regimiento de Castilla, besides of placing this province Coat of Arms on the cross center. Notice the cross arms have been depicted as deprived of any knots, just as in their already known Aragonese counter-part. Albeit admittedly a little odd combination, red over red shouldn't be considered as unlikely as you might believe at a first sight. During the Thirty Years War, Spanish Infantry Colonel Flags were red over red. Not to mention the ever present white over white of French Colonel Flags...

As commented, this one seems a quite simple, forward example. Not so easy are to be other reconstructions --always having in mind we actually have one single real example to build our hypotheses on...