Some Historic Banners, mixed bag of stuff I've done. I have included the download with the zips, as those contain alternate color schemes for the Japanese mons also.

Just download, uzip, go to the file and copy the code you want, open bannerlord and CTRL+V to paste when you're on the banner screen.

Ireland:

Antrim:
4.19.0.1627.1358.764.764.1.0.0.503.116.116.434.460.762.855.0.0.90.505.116.116.465.403.762.660.0.0.0.316.15.116.600.600.764.764.0.0.0.505.22.22.136.233.764.660.0.0.0.505.126.22.136.233.626.650.0.0.0.505.126.22.136.233.897.659.0.0.0.502.116.116.148.250.628.657.0.0.0.502.116.116.150.250.894.657.0.0.0.502.116.116.148.250.761.657.0.0.0.342.142.142.150.180.762.652.0.0.0.327.35.116.150.180.629.652.0.0.0.327.35.116.150.180.899.652.0.0.0.140.142.142.332.265.764.908.0.0.15

Louth:

1.34.142.1627.1358.764.764.1.0.0.514.116.116.407.400.764.878.0.0.0.505.116.116.403.260.764.670.0.0.0.505.149.34.400.242.764.664.0.0.0.514.126.40.392.400.764.868.0.0.0.505.126.126.394.226.764.685.0.0.0.505.149.40.392.200.764.649.0.0.0.333.40.116.150.150.857.644.0.0.0.333.40.116.150.150.670.644.0.0.0.503.125.116.230.230.765.864.0.0.0.342.149.116.198.198.771.861.0.0.0.427.149.149.104.20.684.680.0.0.-6.427.149.149.102.20.685.692.0.0.-6.427.149.149.106.20.874.680.0.0.-6.427.149.149.106.20.873.692.0.0.-6

Tyrone

4.34.142.1627.1358.764.764.1.0.0.514.116.116.400.400.764.878.0.0.0.505.116.116.403.260.764.670.0.0.0.505.34.34.400.242.764.664.0.0.0.514.40.40.392.400.764.868.0.0.0.505.149.40.392.242.764.667.0.0.0.519.40.35.200.200.764.668.0.0.0.424.149.116.170.170.757.666.0.0.0.342.142.116.220.220.771.897.0.0.0

Italy - Medici:

1.34.142.1627.1358.764.764.1.0.0.514.116.116.407.400.764.878.0.0.0.505.116.116.403.260.764.670.0.0.0.505.116.121.400.242.764.664.0.0.0.514.47.40.392.400.764.868.0.0.0.505.47.47.394.226.764.685.0.0.0.505.47.47.392.200.764.649.0.0.0.503.116.116.150.150.764.644.0.0.0.503.138.138.140.140.764.645.0.0.0.424.143.143.60.60.764.675.0.0.0.424.143.143.60.60.735.629.0.0.0.424.143.143.60.60.793.629.0.0.0.503.116.116.105.105.879.762.0.0.0.503.116.116.105.105.683.876.0.0.0.503.116.116.105.105.647.762.0.0.0.503.116.116.105.105.847.876.0.0.0.503.116.116.105.105.765.966.0.0.0.503.145.145.100.100.646.760.0.0.0.503.145.145.100.100.878.760.0.0.0.503.145.145.100.100.682.874.0.0.0.503.145.145.100.100.846.874.0.0.0.503.145.145.100.100.764.963.0.0.0.503.51.145.60.60.638.746.0.0.0.503.51.145.60.60.756.949.0.0.0.503.51.145.60.60.674.860.0.0.0.503.51.145.60.60.870.746.0.0.0.503.51.145.60.60.838.860.0.0.0

Japan Mons (heraldry): (There are already a couple nice ones on reddit someone else did, for Takeda & Mori, so I didn't re-do those)

*These are all just the Black on White, the download have the alternate color schemes like images shown.

Clan Hojo:

11.146.146.3000.3000.777.758.1.0.0.504.116.116.600.600.764.764.0.1.0.504.131.146.580.580.764.764.0.1.0.504.116.116.300.300.764.854.0.0.180.504.146.146.280.280.764.854.0.0.180

Clan Kanamaru:

11.127.127.3000.3000.779.758.1.0.0.503.116.111.240.240.764.764.0.1.180.503.116.111.120.120.764.564.0.1.180.503.116.111.120.120.764.964.0.1.180.503.116.111.120.120.964.764.0.1.180.503.116.111.120.120.564.764.0.1.180.503.116.111.120.120.614.614.0.1.180.503.116.111.120.120.914.614.0.1.180.503.116.111.120.120.614.914.0.1.180.503.116.111.120.120.914.914.0.1.180

Clan Shoni

11.127.127.3000.3000.779.758.1.0.0.505.116.116.100.100.804.664.0.1.315.505.127.127.30.30.804.664.0.1.315.505.116.116.100.100.724.744.0.1.315.505.116.116.100.100.884.744.0.1.315.505.116.116.100.100.804.824.0.1.315.505.116.116.100.100.644.824.0.1.315.505.116.116.100.100.724.904.0.1.315.505.127.127.30.30.724.744.0.1.315.505.127.127.30.30.884.744.0.1.315.505.127.127.30.30.804.824.0.1.315.505.127.127.30.30.724.904.0.1.315.505.127.127.30.30.644.824.0.1.315

Clan Tsutsui

11.127.127.3000.3000.777.758.1.0.0.500.116.116.500.500.764.764.0.1.315.503.116.116.120.120.764.764.0.1.315.503.116.116.120.120.624.724.0.1.315.503.116.116.120.120.904.724.0.1.315.503.116.116.120.120.764.624.0.1.315.503.116.116.120.120.844.884.0.1.315.503.116.116.120.120.684.884.0.1.315