Investiture
1000
Pope Gregory VII was one of the most prominent opponents of lay investiture during the Investiture Controversy in the 11th century. He believed that only the church had the authority to appoint bishops and saw lay investiture as an encroachment on the church's independence.
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Yes, "guests'" is grammatically correct. It is the possessive form of the plural noun "guests," indicating that something belongs to or is associated with multiple guests.
Guests of the hotel may use the pool from 10 am to 10 pm. How many out-of-town guests will visit over the holidays? Oprah has many interesting guests on her show this week. She cleans the house from top to bottom before the guests arrive.
investiture
1969
yes
The Mongolian invasion
lay investiture
sorry, no