こととて
(Koto to te)
since / because (formal, explanatory).
Connection rules
- +V plain / i-adj + こととて; na-adj + な + こととて; noun + の + こととて.
- +Formal / literary causal — apologetic register.
- +Very common in polite apologies: 初めてのこととて, 急なこととて.
Examples
1.
初めてのこととて、不手際をお許しください。

Hajimete no koto to te, futegiwa o oyurushi kudasai.
Since it's my first time, please forgive any mishandling.
「since / because (formal, explanatory)」
2.
急なこととて、ご迷惑をおかけしました。

Kyuu na koto to te, go meiwaku o okake shi mashi ta.
Since it was sudden, I caused you inconvenience.
「since / because (formal, explanatory)」
Practice
Since it was a sudden request, we were unable to prepare sufficiently.
___、十分な準備ができず申し訳ございませんでした。
Romaji also accepted