This is the 10349th most frequent Japanese word.
高円宮
"高円宮" (Takayamado-no-miya) refers to the imperial title of Prince Takamado, a member of the Japanese Imperial Family.
高円宮 in this sentence refers to the formal name/title used for a member of the Japanese imperial family, emphasizing respect and proper titling.
高円宮は尊敬される日本の皇族の名前です。
Kōenomiyasama is the name of a respected Japanese royal family member.
Here, 高円宮 is part of the title of an event, denoting its association or foundation in honor of Kōenomiyasama.
高円宮杯は毎年開催されるサッカーの大会として有名です。
The Kōenomiya Cup is famous as a soccer tournament held annually.
In this usage, 高円宮 refers generally to the individual bearing the name/title and implies involvement in their life or story.