“It is settled that jurisdiction is a threshold issue which is fundamental and crucial to adjudication. A Court cannot assume jurisdiction to adjudicate in a cause or matter unless its jurisdiction has been properly invoked. It is crucial because where a Court proceeds without jurisdiction to hear the case, the proceedings so embarked upon by the Court are a nullity ab initio however well conducted the proceedings and brilliantly decided the issues agitated therein are. See ONYEKWULUJE & ANOR V. ANIMASHAUN & ANOR (2019) LPELR – 46528 (SC), UTOO V. APC & ORS (2018) LPELR – 44352 (SC), MADUKOLU V. NKEMDILIM (1962) SCNLR 341.” Per ADAMU JAURO, JSC in YONGO & ORS v. HAANONGON & ORS (2022-LCER-46535-SC) (Pp 8 – 9; Paras F – B)