Surely, that is correct: gules, a fess argent. No matter how blue in looks. It's Austria. There is always the potential that some pigments are probably more prone to discoloration over time. The light gray, just above, might have been a better choice.
A gold lion on black, if that is a valid interpretation, might refer to the Elector Palatine. Looking for more info on Rudolf I of Pfalz to confirm his heraldic insignia.
In the image itself, three other shields with patterns pop up along the right hand side. There is a horseman's shield with a silver eagle on red. A potential match here could be the 'House of Ivrea', with early connections to Burgundy. No confirmation of someone being in Jerusalem - not much info found with relevant details. Or could it be Frankfurt, does that insignia go back far enough?
Historically, it appears that the 1229 Conquest of Jerusalem was negotiated by treaty, not won by force of arms.
A gold lion on black, if that is a valid interpretation, might refer to the Elector Palatine. Looking for more info on Rudolf I of Pfalz to confirm his heraldic insignia.
In the image itself, three other shields with patterns pop up along the right hand side. There is a horseman's shield with a silver eagle on red. A potential match here could be the 'House of Ivrea', with early connections to Burgundy. No confirmation of someone being in Jerusalem - not much info found with relevant details. Or could it be Frankfurt, does that insignia go back far enough?
Historically, it appears that the 1229 Conquest of Jerusalem was negotiated by treaty, not won by force of arms.