This is the 8240th most frequent Japanese word.
平蔵
"平蔵" is a Japanese name, often used as a male given name. It does not have a specific standalone meaning but consists of "平" (peace, flat) and "蔵" (storehouse).
In this sentence, '平蔵' functions as a proper noun, used as the name of a specific individual. The context suggests he is skilled in swordsmanship.
平蔵は若い頃から剣術の達人だった。
Heizo had been a master of swordsmanship since his youth.
Here, '平蔵' is again a proper noun, referring to a character being central to a narrative being described by the speaker.
私は平蔵を主人公にした物語を書いています。
I am writing a story featuring Heizo as the protagonist.
In this instance, '平蔵' refers to a person whose actions and attributes are well-regarded within the community.