I honestly don't think any of the grand duchesses would have tried at all to seduce the guards. Besides, Maria and Anastasia were still young teen girls at the time and probably too scared to even go near them, let alone try to seduce them. Cleopatra is a whole different story. Yes, she did seduce Ceasar and Marc Antony both, but I think she fell in love with them in the process. Cleopatra married Antony at one point; but I don't think she and Ceasar ever legally married and her marriage to Antony was not considered legal... at least in Rome, because he was still legally married to Ceasar's niece, Octavia. Antony also had two other children with his two other wives: a daughter, Antonia, with Octavia and a son, Antilus, with his first wife, Fulvia, both of which Cleopatra took in to raise with her four children: Ptolemy Ceasar, Cleopatra Selene, Alexander Helios and Ptolemy Philidelphus, three of which were Antony's children.