This is the 9478th most frequent Russian word.
улан
Ulan: A cavalry soldier, traditionally part of light armored units.
The word 'улан' refers to a lancer, a type of cavalry soldier, used here in the context of military.
Улан сражался в кавалерийских рядах.
The lancer fought in the cavalry ranks.
Here, 'улан' symbolizes a character portraying a lancer in a theatrical or dramatic setting.
В историческом спектакле, он играл роль улана.
In the historical play, he played the role of a lancer.
The term 'улан' is used here to describe the grandfather's former profession, adding a historical or personal sentiment.