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Knight vibe (most of them become dukes) x Princess/Saint/Noble Lady …
https://www.mangago.me/read-manga/a_false_confession/

https://www.mangago.me/read-manga/i_m_an_opportunistic_princess_in_charge_of_solving_things/

https://www.mangago.me/read-manga/the_villainess_lives_twice/

https://www.mangago.me/read-manga/my_husband_hides_his_beauty/

https://www.mangago.me/read-manga/the_demon_king_wants_to_die/

https://www.mangago.me/read-manga/the_thorn_that_pierces_me/

https://www.mangago.me/read-manga/the_knight_commander_wants_to_monopolize_the_former_glasses_girl/

https://www.mangago.me/read-manga/honey_i_m_going_on_strike/

https://www.mangago.me/read-manga/the_abandoned_baroness_is_one_of_the_black_knight_s_favorites/

https://www.mangago.me/read-manga/when_the_count_s_illegitimate_daughter_gets_married_sugar_babies/

https://www.mangago.me/read-manga/marriage_of_convenience_scylla_scans/

https://www.mangago.me/read-manga/it_s_been_a_while_since_the_original_novel_was_completed/

https://www.mangago.me/read-manga/your_ryan/

https://www.mangago.me/read-manga/express_contract_marriage_words/

https://www.mangago.me/read-manga/mujikaku_seijo_wa_kyou_mo_muishiki_ni_chikara_wo_tarenagasu_koushaku_ke_no_ochikobore_reijou_totsugisaki_de_shiwase_wo_tsukami_toru/

And how about female knight x prince? ;D
https://www.mangago.me/read-manga/irregular_empress/

https://www.mangago.me/read-manga/emperor_and_the_female_knight/

https://www.mangago.me/read-manga/shadowless_night/

https://www.mangago.me/read-manga/the_duke_of_ashleyan_s_contractual_marriage/

Or knight x maid ^-^
https://www.mangago.me/read-manga/i_was_reincarnated_and_now_i_m_a_maid/

I love you thank you